CHARACTERS OF TRIBES AND GENERA, 951 ` 
lllust. Hook. and Bauer. Gen, Fil, t. 34; Schott. Gen. 
Fil., t. 5; Moore Ind. Fil, p. 93 B; J. Sm. Ferns 
Brit. and For., fig. 134. 
Oss.—The fronds being articulate with the caudex, and 
the pinne and pinnules articulate with the rachis, as also the ` 
sori being confluent in a transverse broad line, between the 
costa and the margin of the pinnules, marks this as a genus 
distinct from Alsophila. The arborescent stem and the 
articulated character of the fronds, being similar to several 
species of Cyathea as already noticed, gives it a claim to , 
rank in the present tribe. 
Sp. T. excelsa (Pr.) (Alsophila Tænitis, Hook. Sp. Fil., 
Mart. Flor. Bras., +. 87; Radd. Fil. Bras., t. 40) (v v.) ; 
T. elegans (Pr.) (Mart. Flora. Bras., t. 98.) 
Oss.—In some specimens of T. elegans the line of sori is 
not so complete as in T. excelsa. 
184.—Lopnoson1A, Presl. (1847.) 
Alsophila, sp., Hook. Sp. Fil. 
Voriünóh fasciculate, erect, arborescent, 6 to 8 feet high, 
densely laniferous. Fronds 3 or more feet in length, com- 
pound multifid, glaucous beneath. Veins simple or forked, 
venules free, their apices clavate. Receptacles small (not 
elevated), sub-terminal. Sori punctiform, solitary on the 
ultimate dents or lacinæ, criniferous. 
Type. Polypodium pruinatum, Sw. 
Ilust. Schk. Fil, t. 25 B.; J. Sm., Ferns, Brit. and 
For., fig. 135. 
Oss.—The Fern on which this genus is founded is a 
native of Jamaica, Mexico, extending through tropical 
America, to Chili and the Island of Juan Fernandez. Tt 
/— was early described by Swartz under the name of Polypo- 
