AN ENUMERATION OF CULTIVATED PERNS. 167 
of the pedicels of the sporangia concrete, forming thickened 
receptacles. Sori round, confluent. 
Genus 82.— Portions of sterile and fertile pinna, natural size, and ditto 
fertile, enlarged. No. 1. 
1. S. Germaniea, Willd. ; Lowe's Ferns, 2, t. 63 ; Hook. Gen. 
Fil. t. 69. Onoclea Struthiopteris, Sw. ; Schk. Fil. 
t. 105. — Germany. 
2. S. Pennsylvanica, Willd. — North America. 
§ 7. Phegopterice. Sori punctiform, rarely oblong, naked, 
or seated in the axis of reflexed indusiform dents. 
83. AMPHIDE6MIUM, Schott. 
Vernation fasciculate, decumbent and criniferous. Fronds 
pinnate, 4-6 feet long, smooth ; pinnae linear-lanceolate, adhe- 
rent. Veins simple or rarely forked, parallel. Receptacles 
punctiform. Sori medial, round, criniferous, irregular, often 
more than one on the same vein. 
