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     Has anyone had success with Isoetes, aka quillwort?  I know it's a 
     slow growing fern, and we have several native species (one, 
     lithophylla, is found only in Burnet and Llano counties, TX, where it 
     lives in pools on granite and limestone outcrops), but that's about 
     it.  I do not know what species I have.  Any info will be appreciated.