PLATE XV. 



A. Delesseria, page 113. 



Fig. 1, D. sanguinea ; 2, winter branch with sporo- 

 phylla; the natural size. 3, a sporophyllum or 

 leaflet, containing tetraspores. 4, a tetraspore ; 9nag- 

 nijied. 5, a winter branch with coccidium ; the na- 

 tural size. 6, a coccidium on its stalk. 7, spores ; 

 magnified. 



B. NiTOPHYLLUM, page 116. 



Fig. 1, N. pnnctatum ; the natural size. 2, frag- 

 ment with spores. 3, a tetraspore. 4, fragment 

 with tubercle. 5, spores from the same ; magnijied. 



C. Plocamium, page 119. 



Fig. 1, P. coccineum ; the natural size. 2, branch 

 with tubercle. 3, tubercle further enlarged. 4, 

 branch with sporophylla. 5, a sporophyllum. 6, a 

 tetraspore from the same ; all magnijied. 



D. Stenogramme, page 123. 



Fig. I, S. interrupta ; the natural size. 2, portion of 

 the frond, with young and mature fruit. 3, section 

 of the frond ; magnijied. 



