Monographs Details: Trichomanes bucinatum Mickel & Beitel
Authority: Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.
Description:Latin Diagnosis - A T. reptante soris valde exsertis longilabiatis et frondibus junioribus saepe lineari-lanceolatis crenatis distinctum. (L., bucina, trumpet, referring to the free, exserted sori.)
Species Description - Rhizome slender, 0.3 mm diam., long-creeping; rhizome hairs dense, dark brown to black, 0.5 mm long; roots lacking; fronds 1.5-4 cm long, 0.5-2 cm wide, distant; stipe ca. 1/10-¼ the frond length, 0.5 mm wide, flattened, alate to base or almost to base, with dark brown to black hairs 0.3-0.5 mm long; blade irregularly pinnatifid, some fronds narrowly lanceolate, 1.5-2.5 cm long, 0.5 cm wide, with short lobes, others with pinnae of differing lengths, broader towards the frond apex, to 2 cm wide, margin entire with both forked and multistellate hairs, many near pinna tips; rachis broadly adnate; veins free, many unconnected false veins parallel to true veins, with scattered short, clavate hairs, 0.1 mm long; sori 1-several, strongly exserted, stalk 0.5-1 mm long; involucre tubiform, 3 mm long, 0.8 mm wide at middle, with large, bilabiate mouth, lips 1 mm long, 1 mm wide, with dark margins made up of several rows of cells.
Discussion:Type. Mexico. Oaxaca: Dist. Ixtlán, trail from San Pedro Nolasco N to the Llano Verde, pine-oak forest with subtropical forest by streams, 6000-7200' [1830-2190 m], 5 Oct 1969, Mickel 4394 (NY!; isotypes to be distributed).
The variable pinnatifid fronds (some narrowly lanceolate to linear with reduced pinnae), some stellate hairs at the tips of pinnae and the strongly exserted sori with long lips separate this species from other members of section Didymoglossum (T. petersii, T. ovale, T. hymenoides, and T. reptans). It resembles T. reptans most closely. The Hidalgo specimen is from the Municipio de Te-nango, carretera Metepe-Tenango de Doria, El Estribo (Canton Norte) at 1800 m (Gimate L. 971, NY).
Distribution:Mexico North America