Cyathea divergens var. tuerckheimii (Maxon) R.M.Tryon
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Authority
Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.
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Family
Cyatheaceae
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Scientific Name
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Description
Variety Description - Trunk to 12 m tall; fronds to 4 m long; stipe brown to tan, lightly to strongly spiny, spines dark, sharp, scales long, bicolorous, dark brown with pale erose margin, stipe very hairy with basal scurf whitish to tan; blade bipinnate-pinnatifid, pinnae stalked, 0.5-2.7 cm long, pinnules usually short-stalked, 1-6 mm long, lobes obtuse, strongly falcate, crenulate, firm-textured, costae hairy above, glabrous below; segments glabrous above and below but sparse brown bullate scales on segment midveins below; fertile veins simple or once-forked; sori medial, indusium sphaeropteroid.
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Discussion
Cyathea tuerckheimii Maxon, Contr. U.S. Natl. Herb. 13: 4. 1909. Type. Guatemala. Alta Verapaz: Nr. Cobán, Türckheim II. 1645 (US!; isotypes F, GH, LE!, MO, NY!, P!, UC). Cyathea jurgensenii Fournier, Mexic. pl. 1: 135. 1872. Type. Mexico. Oaxaca: “In cordillera Oajacensi” [Sierra San Pedro Nolasco], Jürgensen 874 (P; isotype BM!, frag. US!). Cyathea divergens is distinct among Mexican species of Cyathea s.s. (C. fulva) in its lack of costal hairs on the lower blade surface and the frequently long-stalked (1-6 mm) pinnules. There is often a black, tar-like fungus on the upper laminar surface.
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Distribution
Wet montane forests of Atlantic slope; Ixtlán, Mixe, Tehuantepec, Teotitlán, Villa Alta; 450-2400 m. Mexico (Ver, Pue, Oax, Chis); Guat, Nic.
Mexico North America| Nicaragua Central America| Guatemala Central America|