( 4 28) 



near the pedicel in the lower (numerous and scattered in G. multi- 

 porum); pedicels hyaline, elastic, usually of considerable length, 

 cylindric (carotiform in G. inconspicuum and G. germinale), 

 walls thick, the outer portions swelling and becoming gelatinized in 

 moisture to form a jelly-like matrix in which the spores appear 

 imbedded. 



Type species, Gymno sporangium conicum Hedw. f . (said to be on 

 both Juniperus communis and /. sabind) . 

 7. Analytic Keys 



Heteroecious, aecia inhabiting Malaceae (except Nos. 21 and 24). 



mall (12-23/0, wall 



thin (1-1. S/0. 





1. G. Blasialeanum. 



arge (23-39/.), wall 



thick (3-4/O. 





2. G. Sorbi. 



, tubular at first 



(except in No. 27), in some , 



dtered by dehiscenc 







:ornute form, unaltered by dehii 



finally dehiscent ai 



t apex, slightly or not at all U 



al cells verrucose. 

 e walls of peridial c 



ells verrucose only on inner thir 



Side walls of p 



. G. Photir 



rsely and < 



12. G. J 



:ulose. 36. G. 1 



