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      <NetUnrlzdGainsLossesInvstAmt>500318</NetUnrlzdGainsLossesInvstAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>true</AccountantCompileOrReviewInd>
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        <CurrentTaxYearMinus2YearsAmt>431484</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1021987</CurrentTaxYearMinus1YearAmt>
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        <TotalAmt>2623229</TotalAmt>
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      <SubstantialContributorsTotAmt>462752</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>2160477</PublicSupportTotal170Amt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II, Line 9: Organization Reporting of conservation easements.</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization has acquired and holds a number of conservation easements, each representing a legal interest in the land owned by another person or entity. The easements grant the Organization the right to use, control, and protect the land for conservation purposes. Easements donated or purchased by the Organization are not recognized as assets or revenues in the accompanying financial statements because the Organization holds no affirmative rights except to monitor and enforce the easement. If purchased, the costs of conservation easements are expensed when theeasements are acquired. During the year ended December 31, 2017, the Organization did not purchase any conservation easements. At December 31, 2017, the Organization held 125 conservation easements on approximately 89,952 acres of land.Land held for conservation includes land preserves donated or purchased by the Organization for conservation purposes. Acquisitions of land are capitalized at cost, if purchased, or the fair market value on the date of donation, if received as a gift. As of December 31, 2017, the Organization held approximately 2,364 acres of land for conservation purposes.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d: Other revenue amounts included in F/S but not included on form 990</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The Financial Statements and Form 990 are presented at the Board of Directors Meeting Prior to Filing.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>Annually a Conflict of Interest Questionnaire is Completed for each Affected party.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>Annual Review of the Executive Director is Performed by the Executive Committee of the Board of Directors.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization's Form 990 and Form 1023 are Available by Request at the Organization's Office in Austin, Texas.Copies of the Governing Documents, Conflict of Interest Policy and Financial Statements are Available Upon Request at the Organization's Office in Austin, Texas.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
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</Return>