Cyathea tuerckheimii Maxon

Cyathea jurgensenii Fourn. Mex. PL Crypt. 135. 1872
Caudex and stipe undescribed ; primary rachis pale, sulcate, finely muricate, appressedpubescent above ; pinnae petiolate (up to 2 cm.), rigidly membrano-herbaceous, darkgreen above, bright clear green below, oblong-lanceolate, 55 cm. or more long, 12-19 cm. broad, abruptly acuminate, the apical portion deeply and obliquely serrate, the secondary rachis stramineous, smooth or delicately muricate below, glabrescent, a few minute brownish squamules adhering to the sides, above rusty strigose ; pinnules articulate and readily separable, petiolate (the lowermost 3 mm.), 20-25 pairs, lanceolate, 7-10 cm. long, 1.5-2 cm. broad, very deeply pinnatifid, acuminate, the costa rusty-pilose above, below castaneous and glabrous or with an occasional small yellowish-brown scale ; segments 18-20 pairs, close, ovate-oblong, falcate, acute, glabrous throughout upon both surfaces, or with a few deciduous linear scales upon the costule below, the margins obscurely crenateserrate ; veins dark, about 9 pairs, simple or mostly once-forked about half way to the margin, glabrous ; sori
+
4-8 pairs, borne at the forking of the veins, distinctly apart from the costule ; indusium globose, membranous, pale-yellowish, bursting irregularly, the flat lobate basal portion persistent, calyciform ; receptacle yellowish, small, slightly elevated, hirtous.
Type locality : Cordillera of Oaxaca, Mexico. Distribution : States of Oaxaca and Vera Cruz.

Cyathea tuerckheimii Maxon, Contr. U. S. Nat
Herb. 13 : 4. 1909.
Trunk and stipe wanting; fronds ample, at least 130 cm. broad, very deeply tripinnatifid ; primary rachis yellowish-brown below, very densely furf uraceous with minute deciduous yellowish-brown scales and armed with numerous short (1-1.5 mm.) straight erect spines, tuberculate and glabrate with age; pinnae 65 cm. long, 25 cm. broad, petiolate (1.5-2.5 cm.), lanceolate, acuminate, the secondary rachis spinescent, clothed like the primary rachis ; pinnules 11 or 12 cm. long, 1.7-2 cm. broad above the base, about 28-30 pairs below the deeply serrate apex, mostly short-petiolate (the lower ones 4 or 5 mm.), contiguous, narrowly lanceolate, attenuate, mostly at right angles, cut nearly to the costa, the costae yellowish-brown with a few minute short hairs and numerous very caducous glossy darkbrown ovate-lanceolate attenuate erose scales about 2 mm. long ; segments about 20-22 pairs, rigidly coriaceous, narrow, 10-12 mm. long, 3-3.5 mm. broad, falcate, the basal ones separate, the others somewhat dilatate and connected by a narrow wing, the margins simply crenate-serrate, revolute in drying, especially toward the subacute apex, the costules clothed similarly to the costae, but the scales lighter in color (yellowish-brown), triangularovate, long-acuminate, somewhat bullate, with a few stout curved septate whitish hairs intermixed; veins of the segments 10 or 11 pairs, forked near the base, elevated, glabrate ; sori large, yellowish, 6-9 pairs, occupying two thirds or more of the segment, seated at the forking of the veins; indusia membranous, rupturing irregularly, subpersistent; receptacles large, conspicuously hirsute.
Type locality : Near Coban, Alta Verapaz, Guatemala, altitude about 1350 meters. Distribution : Alta Verapaz, Guatemala, at from 1350 to 2000 meters elevation ; region of Orizaba, Vera Cruz, Mexico, altitude about 1300 meters.