i9Hl THAXTER—NEW ZYGOMYCETES 361 



kept in cultivation for eight years. Unfortunately, the culture ran 



out during 



West Indies. Although 



allied to C. cucurbitarum, this species differs in possessing smooth 

 spores of a lighter red-brown color. 



Dissophora, nov. gen. 



Fertile hyphae abruptly differentiated from slender creeping 

 vegetative filaments, stout, of indeterminate growth, and produ- 

 cing sporangiophores which arise as buds, continuously produced, 

 behind its advancing apex. Sporangia and sporangiophores as in 

 Mortierella . 



Dissophora decumbens, nov. sp. — Plate XXVIII 



Primary fertile hypha at first erect, then decumbent, stout, 

 creeping over the substratum indefinitely, rarely septate, some- 

 times producing short branches; the sporangiophores arising irregu- 

 larly from all sides immediately behind its growing apex, tapering 

 somewhat at the base and apex, often septate when mature, rarely 

 branched. Sporangia spherical, columella none, spores spherical 

 or irregularly somewhat angular from pressure; the whole clear 

 white at first, the sporangia becoming slightly yellowish. Primary 

 fertile hyphae up to 10 mm. or more in length, 10-16 \i in diam- 

 eter. Sporangiophores 100-150X8 /x. Sporangia 17-23 /x. Spores 

 about 4 fji. 



On dung of wood mouse from vicinity of Cambridge. 



This species was cultivated for several years, but like the two 

 succeeding forms was unfortunately lost during the writer's absence 

 from Cambridge, so that the accompanying figures and description 

 have been made from mounts and dried material. Although very 

 closely allied to Mortierella, the peculiarities of the primary fertile 

 hypha, which is unlike that of any others of the Mucorales, has 

 seemed sufficient basis for generic separation. The fructification is 

 pure white and easily distinguished among other fungi with which 

 it may be growing. At first it is erect, but soon becomes decum- 

 bent, the older prostrate axis being left behind by the constantly 

 advancing apex (figs. 19 and 26), and reaches a considerable and 



