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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II-B, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>JOHN J. TYLER ARBORETUM SPENT $1,500 FOR THE PA GARDEN DUES, WHICH ADVOCATES FOR PA PUBLIC GARDENS BY CONTACTING STATE REPRESENTATIVES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <CollectionUsedPubExhibitionInd>X</CollectionUsedPubExhibitionInd>
      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <SolicitedAssetsSaleInd>0</SolicitedAssetsSaleInd>
      <CYEndwmtFundGrp>
        <BeginningYearBalanceAmt>10216092</BeginningYearBalanceAmt>
        <ContributionsAmt>124761</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1503796</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>548662</OtherExpendituresAmt>
        <EndYearBalanceAmt>11295987</EndYearBalanceAmt>
      </CYEndwmtFundGrp>
      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>9197660</BeginningYearBalanceAmt>
        <ContributionsAmt>188410</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1388442</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>558420</OtherExpendituresAmt>
        <EndYearBalanceAmt>10216092</EndYearBalanceAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>8868721</BeginningYearBalanceAmt>
        <ContributionsAmt>184107</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>891374</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>746542</OtherExpendituresAmt>
        <EndYearBalanceAmt>9197660</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>9571873</BeginningYearBalanceAmt>
        <ContributionsAmt>449709</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-742885</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>409976</OtherExpendituresAmt>
        <EndYearBalanceAmt>8868721</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>8846955</BeginningYearBalanceAmt>
        <ContributionsAmt>267200</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>811192</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>353474</OtherExpendituresAmt>
        <EndYearBalanceAmt>9571873</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.06819</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.93180</PrmnntEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>1</OtherCostOrOtherBasisAmt>
        <BookValueAmt>1</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>5392116</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>2079047</DepreciationAmt>
        <BookValueAmt>3313069</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>334060</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>238105</DepreciationAmt>
        <BookValueAmt>95955</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>353171</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>119099</DepreciationAmt>
        <BookValueAmt>234072</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>3643097</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>ANNUITY PAYMENT LIABILITY</Desc>
        <Amt>149655</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>REFUNDABLE ADVANCES</Desc>
        <Amt>13041</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>162696</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>5700856</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>941515</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>113438</OtherRevenueAmt>
      <RevenueNotReportedAmt>1054953</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>4645903</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>41565</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>41565</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>4687468</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2875201</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>1776</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>113438</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>115214</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2759987</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>41565</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>41565</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>2801552</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ARBORETUM HAS A MUSEUM OF ANTIQUE FURNITURE THAT IS HELD FOR EDUCATIONAL, RESEARCH AND CURATORIAL PURPOSES. THE COLLECTION IS NOT CAPITALIZED. EACH OF THE ITEMS IS PRESERVED AND CARED FOR, AND ACTIVITIES VERIFYING THEIR EXISTENCE AND ASSESSING THEIR CONDITION ARE PERFORMED CONTINUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ENDOWMENT FUNDS ARE INTENDED TO BE USED TO DEFRAY A PORTION OF THE ORGANIZATION'S OPERATING EXPENSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ARBORETUM IS EXEMPT FROM FEDERAL INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. THE ARBORETUM FOLLOWS THE INCOME TAX STANDARD FOR UNCERTAIN TAX POSITIONS. THE APPLICATION OF THIS STANDARD HAS NO IMPACT ON THE ARBORETUM'S FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>ARBORETUM SHOP MATERIALS &amp; MERCHANDISE 19,776. FACILITY RENTAL EXPENSES 9,308. SPECIAL EVENT EXPENSES 84,354.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>ARBORETUM SHOP MATERIALS &amp; MERCHANDISE 19,776. FACILITY RENTAL EXPENSES 9,308. SPECIAL EVENT EXPENSES 84,354.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>TYLER AT TWILIGHT</Event1Nm>
        <GrossReceiptsEvent1Amt>226374</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>153133</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>73241</GrossRevenueEvent1Amt>
        <FoodAndBeverageEvent1Amt>2197</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>29001</OtherDirectExpensesEvent1Amt>
        <Event2Nm>PLANT SALE</Event2Nm>
        <GrossReceiptsEvent2Amt>105410</GrossReceiptsEvent2Amt>
        <CharitableContriEvent2Amt>1000</CharitableContriEvent2Amt>
        <GrossRevenueEvent2Amt>104410</GrossRevenueEvent2Amt>
        <FoodAndBeverageEvent2Amt>1049</FoodAndBeverageEvent2Amt>
        <OtherDirectExpensesEvent2Amt>43420</OtherDirectExpensesEvent2Amt>
        <OtherEventsTotalCnt>2</OtherEventsTotalCnt>
        <GrossReceiptsOtherEventsAmt>7499</GrossReceiptsOtherEventsAmt>
        <CharitableContriOtherEventsAmt>0</CharitableContriOtherEventsAmt>
        <GrossRevenueOtherEventsAmt>7499</GrossRevenueOtherEventsAmt>
        <FoodAndBeverageOtherEventsAmt>2961</FoodAndBeverageOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>5726</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>339283</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>154133</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>185150</GrossRevenueTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>6207</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>78147</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>84354</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>100796</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE COMMITTEE SHALL BE COMPOSED OF THE PRESIDENT, THE IMMEDIATE PAST PRESIDENT, THE VICE PRESIDENT, THE SECRETARY, THE TREASURER AND THE EXECUTIVE DIRECTOR, AND ONE OTHER TRUSTEE APPOINTED BY THE PRESIDENT. THE EXECUTIVE COMMITTEE SHALL HAVE AND MAY EXERCISE ALL OF THE POWERS AND AUTHORITY OF THE BOARD IN THE MANAGEMENT OF THE CORPORATION THAT ARE SPECIFICALLY ASSIGNED AND DEFINED BY THE BOARD AND MAY ACT ON BEHALF OF THE BOARD IF THERE IS AN EMERGENCY SITUATION THAT REQUIRES ACTION TO PROTECT THE INTERESTS OF THE CORPORATION THAT CANNOT WAIT UNTIL THE NEXT BOARD MEETING OR BE ACTED UPON BY WRITTEN (INCLUDES EMAIL) VOTING. AFTER CONSULTATION WITH THE BOARD, THE EXECUTIVE COMMITTEE SHALL REVIEW AND EVALUATE THE PERFORMANCE OF THE EXECUTIVE DIRECTOR ANNUALLY. THE EXECUTIVE COMMITTEE SHALL DETERMINE THE EXECUTIVE DIRECTOR'S COMPENSATION, SUBJECT TO APPROVAL BY THE BOARD. THE EXECUTIVE DIRECTOR SHALL NOT PARTICIPATE IN THE EXECUTIVE COMMITTEE'S DISCUSSION OF MATTERS PERTAINING TO HIS OR HER EVALUATION OR COMPENSATION</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY AN INDEPENDENT ACCOUNTING FIRM. THE ASSET MANAGEMENT COMMITTEE REVIEWS AND APPROVES THE FORM 990 PRIOR TO FILING. THE ORGANIZATION PROVIDES A COMPLETE COPY TO EACH VOTING MEMBER OF THE ORGANIZATION'S GOVERNING BODY PRIOR TO FILING AND INFORMS BOARD OF ANY DONOR THAT PREFER TO REMAIN ANONYMOUS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CONFLICT OF INTEREST POLICY COVERS THE ARBORETUM'S OFFICERS, TRUSTEES, AND EXECUTIVE DIRECTOR. THE PERSONS COVERED BY THIS POLICY WILL ANNUALLY DISCLOSE TO THE PRESIDENT OF THE BOARD OF TRUSTEES THEIR INTERESTS THAT COULD GIVE RISE TO CONFLICTS OF INTEREST, SUCH AS WITH FAMILY MEMBERS, SUBSTANTIAL BUSINESS OR INVESTMENT HOLDINGS, AND OTHER TRANSACTIONS OR AFFILIATIONS WITH BUSINESSES AND OTHER ORGANIZATIONS OR THOSE OF FAMILY MEMBERS. FOR EACH INTEREST DISCLOSED TO THE PRESIDENT OF THE BOARD OF TRUSTEES, THE PRESIDENT WILL DETERMINE WHETHER TO: (A) TAKE NO ACTION; (B) ASSURE FULL DISCLOSURE TO THE BOARD OF TRUSTEES AND OTHER INDIVIDUALS COVERED BY THIS POLICY; (C) ASK THE PERSON TO RECUSE FROM PARTICIPATION IN RELATED DISCUSSIONS OR DECISIONS WITHIN THE ARBORETUM; OR (D) ASK THE PERSON TO RESIGN FROM HIS OR HER POSITION IN THE ARBORETUM OR, IF THE PERSON REFUSES TO RESIGN, BECOME SUBJECT TO POSSIBLE REMOVAL IN ACCORDANCE WITH THE ARBORETUM'S REMOVAL PROCEDURES. THE ARBORETUM'S EXECUTIVE DIRECTOR AND ASSET MANAGEMENT COMMITTEE WILL MONITOR PROPOSED OR ONGOING TRANSACTIONS FOR CONFLICTS OF INTEREST AND DISCLOSE THEM TO THE PRESIDENT OF THE BOARD OF TRUSTEES IN ORDER TO DEAL WITH POTENTIAL OR ACTUAL CONFLICTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>INDEPENDENT BOARD MEMBERS ANNUALLY REVIEW AND APPROVE COMPENSATION USING FEDERAL FORM 990 DATA OF SIMILARLY QUALIFIED PERSONS IN FUNCTIONALLY COMPARABLE POSITIONS AT SIMILARLY SITUATED ORGANIZATIONS. THE BOARD DISCUSSES THE EXECUTIVE DIRECTOR'S COMPENSATION WHEN THE BUDGET IS REVIEWED. THIS WOULD BE DONE IN EXECUTIVE SESSION. THE ASSET MANAGEMENT COMMITTEE WOULD FIRST REVIEW AND MAKE A RECOMMENDATION TO THE BOARD. THE DELIBERATION AND FINAL DECISION ARE TIMELY DOCUMENTED ANNUALLY DURING THE BUDGET PROCESS. THIS PROCESS DESCRIBED HERE WAS LAST COMPLETED IN 2026.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST AT THE ARBORETUM'S ADMINISTRATIVE OFFICE DURING NORMAL BUSINESS HOURS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART VI, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>PURSUANT TO THE ORGANIZATION'S BYLAWS, THE BOARD MAY ESTABLISH COMMITTEES AND DELEGATE TO THOSE COMMITTEES THE AUTHORITY TO EXERCISE THE POWERS OF THE BOARD, SUBJECT TO SPECIFIED LIMITATIONS AND MATTERS RESERVED TO THE FULL BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>