Monographs Details:
Authority:
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Family:
Cyatheaceae
Cyatheaceae
Description:
Species Description - Trunks to 6 m tall; stipes with sharp-pointed spines, light to medium brown, scales concolorous, brown; blades 2–3 m long, bipinnate-pinnatifid, papyraceous, pinnae with stalks 0.6–0.7 cm, rachises and pinnae with sparse sharp spines; pinnules essentially sessile, stalks 1 mm, apices acute to acuminate, curved, coarsely crenate to dentate; segments densely hairy on rachises and pinna axes; adaxial surfaces densely short-hairy on pinnules, some hairs also on segment midveins; abaxial surfaces with hairs and minute bullate scales; sori medial, receptacles pilose, indusia absent; 2n =138 (Jam).
Species Description - Trunks to 6 m tall; stipes with sharp-pointed spines, light to medium brown, scales concolorous, brown; blades 2–3 m long, bipinnate-pinnatifid, papyraceous, pinnae with stalks 0.6–0.7 cm, rachises and pinnae with sparse sharp spines; pinnules essentially sessile, stalks 1 mm, apices acute to acuminate, curved, coarsely crenate to dentate; segments densely hairy on rachises and pinna axes; adaxial surfaces densely short-hairy on pinnules, some hairs also on segment midveins; abaxial surfaces with hairs and minute bullate scales; sori medial, receptacles pilose, indusia absent; 2n =138 (Jam).
Discussion:
Polypodium microdontum Desv., Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 5: 319. 1811. Alsophila microdonta (Desv.) Desv., Me´m. Soc. Linn. Paris 6: 319. 1827. Trichipteris microdonta (Desv.) R. M. Tryon, Contr. Gray Herb. 200: 46. 1970. Type. “America australi?” s. coll. s.n. (P!)
Cyathea microdonta is distinguished by its slender spines on the rachises and secondary axes, whereas in other species of Cyathea, spines, when present, are limited to the stipes.
Distribution:
Mexico North America| Bolivia South America| Brazil South America| Peru South America| Amazonas Ecuador South America| French Guiana South America| Trinidad and Tobago South America| Venezuela South America| Amazonas Colombia South America| West Indies| Jamaica South America| Cuba South America| Panama Central America| Costa Rica South America| Nicaragua Central America| Honduras Central America| Guatemala Central America| Belize Central America|
Mexico North America| Bolivia South America| Brazil South America| Peru South America| Amazonas Ecuador South America| French Guiana South America| Trinidad and Tobago South America| Venezuela South America| Amazonas Colombia South America| West Indies| Jamaica South America| Cuba South America| Panama Central America| Costa Rica South America| Nicaragua Central America| Honduras Central America| Guatemala Central America| Belize Central America|