Didymoglossum krausii (Hook. & Grev.) C.Presl
Descripción
Difficult to distinguish from the much more common T. reptans, but T. krausii can be identified by its occurrence at low elevations, 0–500(–1070) m (vs. 900–2500 m in T. reptans), and the false veins being more or less parallel to the margins and generally not between the true veins; 2n=136 (Jam).A
Ejemplar revisado
(Related to the synonym Trichomanes krausii) Chis (Breedlove 32824, DS, 57304, CAS). Oax (Mickel 5770, 7390a, NY, UC). Pue (Pacheco 3214, UAMIZ). SLP (Mickel 595, ISC). Tam (Pacheco 3027, IEB, UAMIZ, 3028, MEXU, UAMIZ). Ver (Copeland herb. 11, UC, US; Riba et al. 1155, UAMIZ).
Unverified, Doubtful, or Mistaken Reports. QR (Castillo R. & Tun G. 290, UADY, XAL, cited by Palacios-Rios, 1992, but not verified).A
Unverified, Doubtful, or Mistaken Reports. QR (Castillo R. & Tun G. 290, UADY, XAL, cited by Palacios-Rios, 1992, but not verified).A
Elevación
0 – 500 mA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym) Trichomanes krausii is distinct by its occurrence at low elevations, some false veins parallel to the blade margins (virtually none between true veins), and immersed sori. These characters work best for specimens below 500 m, and character states of T. reptans work best for specimens above 1500 m. At intermediate elevations specimens combine the characters, e.g., few false veins and exserted sori. Generally the most false veins are found in specimens collected above 2000 m and fewest below 500 m. More work is needed to resolve the taxonomic status of these two taxa.A