AS EKUMEEATION OP CULTIVATED PEENS. 247 



forked; venules free, their apices thickened, Sori medial, 

 criniferous. Beeeptacle scarcely elevated. Indusimn absent.* 



1. L. pruinata, Prosl. Potypodium prninatum, 8w. Also- 

 phila pri in ita, Kcmlf. Polypodium griseum, Bchh. 

 ML t. 25 i.— Tropical America. 



Genus 135. — Portions of fertile &ond, natural size. No. i . 



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

 Klot. — Venezuela. 



Sub-Oeder n.— GLEICHENIACE.ffl. 



Sporangia globose or pyriform, fm-nished with a transverse 

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

 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 ; pinnae linear, 



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

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



