AN ENUMERATION OF CULTIVATED FERNS. 247 



forked; venules free, their apices thickened. 8ori medial, 

 criniferous. Receptacle scarcely elevated. Indusiwm absent.* 



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

 phila pninita, Kaulf. Polypodium griseum, Schk. 

 FiL t. 25 B — Tropical America. 



Genus 135.— Portions of fertile frond, natu-al size. No. ] . 



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

 Klot. — Venezuela. 



Sub-Order II.-GLEICHENIACE^l. 



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. Br. 



Vernation uniserial and sarmentose. Fronds 1-6 feet high 

 once or more times dichotomously branched; pinna? linear, 



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

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



