19*4 THAXTER—NEW ZYGOMYCETES 363 



rangiophore is produced, but often elongate and bearing large num- 

 bers of the latter which arise from all sides without regularity. 



The genus resembles Dissophora in possessing specialized struc- 

 tures from which the sporangiophores arise, but is clearly distin- 

 guished from the fact that these structures are intercalary and 

 determinate, as well as by its peculiar sporangia. In general 

 appearance, and in its habit of producing its sporangiophores in a 

 radiate fashion from the segments of repent filaments, it closely 

 resembles certain hyphomycetous forms like Hyalopus or Cephalo- 

 sporium, and it was at first mistaken for an imperfect fungus of 

 this nature when examined with a hand lens. The sporangia are 

 very minute, even when they contain two spores, and the plant 

 would hardly be taken for one of the Mucorales unless examined 

 with some care. The presence of numerous septa in the sporan- 

 giferous segments also serves to render the general appearance of 

 the fungus deceptive. 



Both the species described below have been cultivated on nu- 

 trient agar, one of them for nearly twenty years; but, as has been 

 previously mentioned, both were recently lost, and the material 

 now available consists of dried specimens and glycerine mounts. 

 In the accompanying figures no attempt has been made to represent 

 the general appearance of the mesh of sporangiophoric segments 

 which, though very striking in appearance, is too intricate for 

 satisfactory drawing. The segments illustrated are small, but 

 many occur which may reach a millimeter or more in length, with 

 more or less clearly marked constrictions where septa occur. They 

 are rigid and usually very straight, tapering off at the ends to fine 

 filaments which may at once pass into another segment, or branch 

 and run for a considerable distance before this occurs. 



Haplosporangium bisporale, nov. sp. — Plate XXIX 



Clear white becoming yellowish with age, forming a dense 

 cobweb-like layer on the substratum, composed of slender filaments 

 connecting the fertile segments which form the greater portion of 

 the layer and may be very short, producing only a single sporangio- 

 phore, or may reach more than a millimeter in length and produce 

 large numbers of the latter develoned at right angles and in all 



