AN ENUMERATION OF CULTIVATED FEKNS. 



247 



forked; venules free, their apices thickened. Son medial,, 

 criniferous. Receptacle scarcely elevated. Indusiwm absent.* 



1. L. pruinata, Presl. Polypodium pruinatum, Sw. Also- 

 phila pruinata, Kaulf. Polypodium griseum, 

 FiL t. 25 B Tropical America. 



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



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

 Klot. Venezuela. 



SUB-ORDER II. GLEICHENIACE-EI. 



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, E. Br. 



Vernation uniserial and sarmentose. Fronds 16 feet high 

 once or more times dichotomously branched; pinnaa linear, 



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

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



