Pityrogramma Link
Descripción
Rhizomes erect, woody; rhizome scales concolorous; fronds medium-sized, clumped; stipes brown to atropurpureous, mostly glabrous; blades 1–3-pinnate, chartaceous to coriaceous, usually with white or yellow farina abaxially, infrequently with hairs (not ours); veins free; sporangia along veins, veins obscured by farina so sporangia appear in indistinct lines or scattered black dots; indusia and paraphyses absent; spores tetrahedral-globose, dark; x=30, 58, 60.A
Forma de vida
TerrestreA
Distribución
México (país) Nativo y no endémicoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Pityrogramma is a genus of about 17 species, mostly of the American tropics; there are 12 species in America and 4 in Mexico. They are common plants of roadsides and other disturbed soil banks, of low to high elevations. One species of western North America, Pityrogramma triangularis, is now placed in Pentagramma, a genus differing from Pityrogramma in size, habit, habitat, chemistry, and spore morphology. Trismeria is often segregated from Pityrogramma because of its distinct habit, blade dissection, and spores. R. Tryon (1962) reported hybridization between Trismeria and species of Pityrogramma. Pityrogramma is related to Anogramma, less so to Eriosorus and Jamesonia, but is distinct by the combination of farinose abaxial blade surfaces, pinnately divided blades, gymnogrammoid sori, and erect woody rhizome.A