21 



W^Oi whole surface of the Spbacelial grov/th including that of the channels 



and holes is covered by closely appressed elongated conidiophores, eadh 



1^ ■/ « I ' , t 

 one supporting a conidium. 5!he cmidia are fowned continuously on these 



spore-hearing organs. The hyphae from which the conidiophores arise renain 

 the same as those formed upon the germination of the ascospores. Closely con- 

 nected vath the formation of nasses of conidial* , is the abundant secretion 

 of the "honey dew" previously described, vihich holds in suspension liberated 

 conidia and which carries them out of the spbacelial growth. The conidia 

 are very numerous, are spherical to sphaeroidal hyaline, and very small? -x 3.5|x 



For a considerable time, little was known regarding the true 

 nature of the spbacelial spores, in spite of the fact that their importance 

 had long been recognized. Berg (19) considered them as spematia in the 

 sense of male fertilizing organs, but this conception was disproire^ 1^ KUhn 

 who showed tihat they were procreative cells - the "stylospores" of the ergot 

 fungus, fie ajyplied the term "Stylo sporen" and not conidia to the spbacelial 

 spores of Clavice-ps tvuhina . because of tlie peculiar way in which they were 

 borne. He thought that they corresponded fully to the uredo-spcres of 

 Uredineae. In his book (144) published shortly before his paper (145) Kuhn 

 referred to Tulasne's secondary spores as '*Keimh'6rner" . 



JBhysiology 



Very little cultural work has been done with C_. "purriurea and 

 practically none with the other species of the same genus. The first man v*io 

 studied C.purparea under artificial conditions mas Brefeld (29) He trans- 

 ferred spores of C. purporea to bread T/hich had been sterilized and soa^feed in 

 — ,s«/ 



a nutrient solution. The spores germinated readaTly, producing a rich growth 

 and numerous conidia (sphacelia) typical in all respects to those developed 

 on infected plants. 



