90 



British UredinecE and Ustilao^inece- 



brancHes of the mycelium which are given oft" into the 

 air. Upon these numerous short, lateral branches are given 

 off, which swell up at the ends and become crescentic 

 spores (Fig. 15). No conjugation takes place between 

 these bodies. The branches of the mycelium which are 

 given off in the fluid do not produce spores, but grow 

 outwards until at length they reach the air, when they 

 produce terminal spores or they remain sterile. In the 

 latter case the hyphae are empty and septate. Brefeld 

 has further observed that by long-continued culture the 



hyphse, under certain circum- 

 stances, become nodose, and ap- 

 parently develop certain globose 

 bodies which closely resemble the 

 original teleutospore.* 



Entylonia. — The germination 

 of Entyloma, though similar to 

 that of Tilletia, is far less com- 

 plex. 



E. micfosporuin. — De Bary t 

 found that if the spores were 

 wholly immersed in water, they, 

 in the course of twenty-four hours, 

 would give out a germ-tube from 

 ^- . J- , , ■ . four to ten times the length of 



Fig. 8. — Entyloma microsporum. '^"^ >-^ o 



a, Teleutospore germinating (the ,t cnnrp At ifq rnimdpd SUm- 



promycelial spores have conjugated tnC SpOlC. tW. US rOUllUCU MUll 



at their upper eud-i) ; /■, two secondary' . , . -,• ^ „„,,^ ^CC 



spores produced from the conjugated Ullt thlS prOmyCChum gaVC Ott 



pairs of primary promycelial spores ; _ ^ \ C 



<:, teleutospore of ^. crtAv/./K^/', which SIX or scvcn brancncs, eacn 01 



has produced five promycelial spores, 



four of which have conjugated below, -vvhich vvas dilated UDwards ; and 



(De Bary.) ^ 



when they attained a length 

 measuring 30 or 40^/, each became cut off by a basal 

 septum. They conjugate in pairs, by a transverse bridge, 



* Brefeld, loc. cit., t. xiii. figs. 46-52. 



t De Bary, Bot. Zeitwig {i^l \) , pp. 81-92, 97-108, t. ii. 



