• R. M. Tryon
Part of the The Families and Genera of Vascular Plants book series (FAMILIES GENERA, volume 1)


Terrestrial or rupestral, or (Ceratopteris) aquatic ferns of mostly small size, exceptionally leaves are to 6 m long. Stem erect to long-creeping, with a medullated protostele, a solenostele, or a dictyostele, bearing trichomes or scales or both. Petiole with 1 to 4 vascular bundles (or to many in Ceratopteris) near the base, terete to adaxially sulcate or two-ridged. Lamina usually pinnate, or entire, pedate, palmate, radiate, or the petiole furcate apically into two strongly recurved rachises; veins usually free, if anastomosing the areolae without free included veinlets. Sporangia in exindusiate, short to long soral lines along the veins or in marginal son or soral lines, and then usually covered by a modified marginal indusium, with or without special trichomes among the sporangia. Sporangia usually long-stalked, the stalk of 2 or 3 rows of cells (rarely to 5 rows), annulus vertical or rarely oblique, interrupted by the stalk. Spores trilete, rarely alete, without chlorophyll.


Vascular Bundle Abaxial Side United States South Distal Face Ultimate Segment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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