AN ENUMERATION OF CULTIVATED FERNS. 247 
forked; venules free, their apices thickened. Sari medial, 
criniferous. Receptacle scarcely elevated. Indusium absent.* 
1. L. pruinata, Presl. Polypodium pruinatum, Sw. Also- 
phila pruinata, Kaulf. Polypodium griseum, Schlc. 
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 . — V enezuela. 
Sub-Order II. — GLEICHENIACEiE. 
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, R. Br. 
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. 
