SECT. I 



CRYPTOGAMS 



i:,\ 



Fio. 8'.it5. — Aspulium. Jilix mas. (i nat. size.) A, Sorus iu vertical section (x 20, after Kny) ; 

 B, pinna with young sori still covered by the indusia ; (', somewhat older sori with withered 

 indusia. (Slightly raaKnitied.) Official. 



single layer of cells, inve.st the stems, petioles, and sometimes also tlie leaves of 

 most Ferns, 



