244 BOTANICAL GAZETTE [October 



myceKal strand from which it arises (fig. 22). The body thus 

 formed is the primordium from which the pycnidium arises. 



In the genus Sphaeronaemella a striking variation of the meris- 

 togenous development is found. A few cells of a main mycelial 

 thread begin to divide as in the simple meristogenous mode, but 

 short hyphal branches arise from these, usually on one side, curling 

 and twisting about each other to form a ball-like mass. In some 

 cases this mass envelops and includes the main hypha (fig. 84). 



Gloeosporium Desmazieres and Montaigne 



Gloeosporium rufomaculans (Berk.) Thiim.; isolated from fruit 

 of apple (Pyrus malus L.) from Neoga, Illinois, September 191 7. 



The primordium of the acervulus arises from a number of neigh- 

 boring hyphae. These branch into short hyphae which branch 

 in turn, forming a loosely woven network. A spreading tuft arises 

 from this loosely woven base (fig. 87). This cushion with its tuft 

 of short hyphae is the primordium. It usually originates sym- 

 phogenously, sometimes meristogenously. 



Gloeosporium musarum C. and M.; isolated from a banana 

 {Musa sapientum L.) from the Champaign market, July 28, 1916. 



Short hyphal branches from main mycelial strands interweave 

 near their ends. Other hyphae intertwine about this initial portion. 

 Some branches fold or loop back upon themselves, while still others 

 branch again. The cells of the interwoven mass divide, swell, and 

 branch (fig. 88). At length a cushion-like base is formed. .This 

 is the primordium of the acervulus, from which short conidiophores ■ 

 arise which bear conidia. In terms of pycnidial development it 

 arises symphogenously. In culture this fungus bears many spores, 

 either sessile or upon short conidiophores outside of acervuli^ 

 scattered freely upon the mycelium. These spores appear before 

 the formation of acervuli, making the study of the beginning of 

 acervuli difficult. 



CoLLETOTRiCHUM Corda 



Colletotrichum lagenarium (Pers.) E. and H.; isolated from a 

 watermelon {Citrullus vulgaris Schrad.) procured on the Champaign 

 market, September 191 7. 



