60 TEXT-BOOK OF FUNGI 



portions of protoplasm. Thaxter has corroborated Leger's 

 statement, and in addition has described a species of 

 Syncephalastrum in which the sporangia are more or less 

 clavate or swollen at the apex, and having more than a 

 single row of spores in the swollen portion, thus forming 

 a connecting link between globose and cylindrical sporangia. 



Not unfrequently in certain members of the Mucorineae, 

 Absidia^ and certain species of Mucor^ the gametes do not 

 come in contact, yet each branch forms a body similar in 

 appearance to a zygospore, and equally capable of germina- 

 tion ; in other instances similar bodies are produced singly 

 and not in pairs ; such structures are called azygospores. 

 Whether these bodies, apart from fecundation, agree cyto- 

 logically with normal zoospores, is not known. 



Chlamydospores are usually distinguished among asexual 

 spores by not being borne on specialised sporophores, but 

 occur in chains in the length of ordinary vegetative hyphae. 

 Alternate cells of the chain become enlarged by absorbing 

 the protoplasm of adjoining cells, and assume a barrel- 

 shape with a thick cell- wall. These, when mature, are 

 liberated by the dissolution of the alternate empty cells. 

 Brefeld has dealt in detail with chlamydospores in 

 Chlamydomucor racemosus, Nyctalis, and Oligoporus. 

 Ward has also noted their presence in Onygena equina. 

 In some instances chlamydospores are formed on very 

 short lateral branches springing from prostrate hyphae, as 

 in Mycogone, a conidial form of Hypomyces. Respecting 

 the mode of origin of zoospores, which are produced by 

 some species belonging to the Phycomycetes, our know- 

 ledge is incomplete. Wager states that from five to eight 

 nuclei are present in the zoosporangia of Cystopus candidus 

 when cut off from the sporangiophore by a septum. Each 



