Abstract
Recent collections of Thelypteris from Mexico, especially from the fern-rich states of Oaxaca and Chiapas, necessitate the description of several new taxa and reevaluation of some older circumscriptions by the last monographer of the genus (Christensen, 1913). The large number of Neotropical species of Thelypteris (ca. 300) and the widespread distribution of many of these species make a systematic study of the two largest subgroups, subg. Goniopteris and subg. Amauropelta, unfeasible at this time. In lieu of such a revision, admittedly badly needed, I present below keys to the Mexican species of subgenera Amauropelta and Goniopteris. The keys are followed by descriptions of new taxa, new combinations, and other brief notes. For the remaining two subgroups of Thelypteris with more than single species in Mexico, i.e., Cyclosorus and Meniscium, there exist current treatments (Smith, 1971b; Maxon & Morton, 1938). I am grateful to the curators at CAS, DS, GH, MICH, NY, and US for making their collections available for study.
Published Version
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