i dium pruinatum, by later authors it has been referred to 
-  Scattered with two or more sori on some of the venules, 
. densely furnished with criniferous hairs. 
A3 — | CHARACTERS OF TRIBES AND GENERA. 
Alsophila, under which genus it stands in the “Species — 
Filicum," but it differs from the true species of that genus 
in having deltoid multifid fronds. The only character 
that gives it a claim to rank as a species of that genus is 
its arborescent stem, and criniferous sori, which, in some 
specimens the latter character is scarcely evident; the 
stem also differs from true Alsophila in being densely — 
laniferous, indeed, if it was not for its arboroid stem I 
. would have no hesitation in placing it under Phegopteris, as 
an ally to Phegopteris lachnopoda. Presl has considered it 
worthy of being raised to the rank of a distinct genus, 
which, in order to mark its peculiarities I adopt, and, 
with Trichopteris and Amphidesmium, view it as an aberrant 
genus of this tribe. 
Sp. L. pruinata (Presl) (v v.) (Polypodium griseum, Schk. 
Fil., t. 25.) 
135.—Awrnipzsum, Schott. (1834). 
Metaxya, Presl., 1836 ; Alsophila, Hook. Sp. Fil. 
Vernation fasciculate, erect, arboreous, criniferous. Fronds 
pinnate, 4 to 6 feet long, smooth, glossy ; pinnw 6 to 12- 
inches long, linear lanceolate, acuminate, serrated towards SS 
the apex, adherent to the rachis. Veins simple or rarely 
. forked near their base, parallel, patent, Sori punctiform, ` 
lateral, basal, transverse uniserial near the costa, as also 
Type. Polypodium blechnoides, Rich. (P. rostratum, Humb.) 
Ilust. Hook. and Bauer. Gen. Fil., t. 42 B; Moore Ind. 
Fil., p. 86 A; J. Sm. Ferns Brit. and For., fig. 83. i 
ek: 
Ors.— This genus is founded on a solitary species, a nati 
