362 BOTANICAL GAZETTE ' [october 



more or less indefinite length. Immediately behind the blunt stout 

 apex scattered buds arise (fig. 26), which soon become clavate 

 branches, slightly divergent or even appressed, and as one traces 

 these branches backward from the tip a gradual transition is seen 

 from the first buds to the fully matured sporangiophores (figs. 19 

 and 20), and when the older portions of the axis are reached, the 

 old sporangiophores alone are found from which the sporangia have 

 disappeared (fig. 21). In a few instances the sporangiophores have 

 been seen to be replaced by a branch on which two or several 

 sporangiophores may be borne. As the latter become fully mature, 

 and when the spores are ripe, one or more septa usually make their 

 appearance and may also occur in the older parts of the fertile axis 

 at considerable intervals. The latter originates from very slender 

 hyphae running on the substratum and are very abruptly distin- 

 guished from them (fig. 25). Whether the mycelium is parasitic as 

 it grows in nature has not been determined, but it develops very 

 readily on potato agar without the presence of any host. 



Haplosporangium, nov. gen. 

 Mycelium of slender branching filaments forming a fel 



- 



the surface of which numerous intercalarv or terminal 



become differentiated, formin 



segment 



from 



which sporangiophores are radiately produced, of characteristic 

 form, broad at the base and attenuated distally to a threadlike 

 termination which bears the primary sporangium and may be 

 subtended by one, rarely two, threadlike secondary sporangio- 

 phores. Sporangia monosporous or bisporous. 



The species of this genus differ from those of Mortierella. 



highly 



a very long segments, from wl 

 bearing threadlike termination 

 educed minute sDoranzia contc 



sometimes two, spores. The sporangiferous segments are very 



forming 



m\ 



mere swelling from which a sin 



