Terpsichore A.R.Sm.
Descripción
Rhizomes shortcreeping to ascending, generally weakly dorsiventral to radially symmetric; rhizome scales brown to blackish, infrequently orangish, dull to usually lustrous, non-clathrate, glabrous or with variously colored setulae; fronds monomorphic, determinate or indeterminate; stipes articulate or not, nearly absent to equaling the blades in length; blades pinnatisect to 1-pinnate, rarely 1-pinnate-pinnatifid, forking in a few species, gradually tapering distally; indument on rachises, costae, veins, and sometimes laminar tissue (both sides) of reddish brown to tawny or whitish setae 0.5–3 mm, also sometimes of branched or unbranched hairs 0.1–0.2 mm, these sometimes glandular; hydathodes present adaxially, sometimes producing calcareous secretions (lime-dots); veins simple, pinnate from the costae, free, hidden or easily visible; sori round, not sunken into the laminae, exindusiate; soral paraphyses absent; sporangia glabrous or setose on the capsules; spores tetrahedral-globose, oblate, or reniform, with a trilete or monolete scar; x=37.A
Forma de vida
Epífita, o raramente Epipétrica. TerrestreA
Distribución
México (país) Nativo y no endémicoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Terpsichore comprises about 50 neotropical species and one, T. elastica (Bory exWilld.) A. R. Sm., in Africa, Madagascar, and the Mascarenes. Characteristics defining Terpsichore include the presence of rather conspicuous hydathodes on the adaxial surface of the blades (thus, differing from Ceradenia and Enterosora); reddish, atropurpureous, tawny, or hyaline setae often greater than 1 mm long on the stipes, rachises, costae, veins, and sometimes laminar tissue (thus, differing from Lellingeria); absence of glandular paraphyses in the sori; non-clathrate, usually castaneous or atropurpureous, concolorous rhizome scales that are usually setulose along the margins, or at least at tips (thus, differing from Melpomene); rhizomes generally weakly dorsiventral to occasionally radially symmetric; more than one (often 8–40) sorus per segment or pinna (thus, differing from Micropolypodium); and free, unbranched veins from the costae.
Based on molecular data using rbcL and atpB genes, Terpsichore may be polyphyletic, as currently construed, although the species groups defined by Smith (1993) are quite likely monophyletic (Ranker et al., unpubl. data). Group 1, in Mexico, contains only T. asplenifolia, and this group forms one of the basalmost elements in Grammitidaceae, a family probably of Neotropical origin. Group 2, the T. taxifolia group, comprises Terpsichore semihirsuta and T. anfractuosa, among many others, and is very likely monophyletic; T. subtilis (Group 4) is closely allied to, and probably inseparable from, Group 2, on the basis of both morphological and molecular evidence. Nearly all members of this clade have black clavate fungi on the blades, the ascomycete genus Acrospermum. Group 3 comprises the remaining five Mexican species T. cultrata, T. delicatula, T. mollissima, T. senilis, and T. spathulata, and this group forms a separate clade, in preliminary molecular analyses.
A
Based on molecular data using rbcL and atpB genes, Terpsichore may be polyphyletic, as currently construed, although the species groups defined by Smith (1993) are quite likely monophyletic (Ranker et al., unpubl. data). Group 1, in Mexico, contains only T. asplenifolia, and this group forms one of the basalmost elements in Grammitidaceae, a family probably of Neotropical origin. Group 2, the T. taxifolia group, comprises Terpsichore semihirsuta and T. anfractuosa, among many others, and is very likely monophyletic; T. subtilis (Group 4) is closely allied to, and probably inseparable from, Group 2, on the basis of both morphological and molecular evidence. Nearly all members of this clade have black clavate fungi on the blades, the ascomycete genus Acrospermum. Group 3 comprises the remaining five Mexican species T. cultrata, T. delicatula, T. mollissima, T. senilis, and T. spathulata, and this group forms a separate clade, in preliminary molecular analyses.
A