AN ENUMEKATION OF CULTIVATED EERNS. 



247 



forked; veimles free, their apices thickened. Sori medial, 

 criniferous. Receptacle scarcely elevated. Indusium absent.* 



1. L. pruinata, Presl. Poly podium pruinatum, Sw. Also- 

 ^hila pruinata, Kaulf. Polypodium griseum, Sclik. 

 Fil t. 25 B. Tropical America. 



Genus 135. Portions of fertile frond, natural size. No. 1 . 



2. L. affinis, Presl. Alsophila affinis, Fee. A. Deckeriana, 

 Klot. Venezuela. 



SUB-ORDER II. GLEICHENIACE^I. 



Sporangia globose or pyriform, furnished with a transverse 

 or sub-oblique ring. Fronds rigid, opaque. Sori punctiform, 

 intramarginal, naked or rarely with a peltate indusium. 



136. GLEICHENIA, B. Sr. 



Vernation uniserial and sarmentose. Fronds 1-6 feet high 

 once or more times dichotomously branched; pinnae linear, 



* Setting aside the arborescent character of the stem, this genus is more 

 naturally related to the section Desmopodium of Phegopteris than to Alsophila. 



