BUTLER AND HAFIZ 195 



Fig. I, which we take to represent the union of several unilocular 

 stromata, to truly multilocular pseudo-parenchymatous masses. 

 The cavity is usually narrow, due to cushion-like projections of the 

 wall into the lumen. In small unilocular stromata, the cushion 

 arises usually at the base, the cavity being convex outwards. 

 In larger stromata cushions may also project from the sides, lead- 

 ing to very irregular formations. In transverse section through 

 the middle of the stroma (PI. Ill, Fig. 3), the cavities are quite 

 irregular in position, but near the apex the arrangement may be 

 roughl}^ circular, due probably to several loculi converging to a 

 common opening. Ijaterally situated loculi may, however, open 

 by separate orifices. In longitudinal section (PI. Ill, Fig. 2), 

 there is no uniformity of disposition or size of the cavities. The 

 mouth is formed late and is usually not prominent. 



The spores are of two kinds, both borne on exactly similar 

 sporophores. The latter arise from the innermost laj^er of the 

 pseudo-parenchyma, which is not sharply marked off as a 

 hymenium but consists simply of small, rather elongated cells, 

 light yellow in colour (PI. IV, Fig. 6). From these one or more 

 hyaline sporophores arise and project into the cavity. Usually 

 the sporophore is branched, the branches arising chiefl}^ near the 

 base and each terminating in a single spore (PL IV, Figs. 7 & 8). 

 In some stromata unbranched sporophores predominate (PI. IV, 

 Fig. 9). Septa occur sparingly and the ultimate branches are 

 always slender and unseptate. Each sporophore appears always 

 to bear only one kind of spore, but as they are closely crowded 

 at the base, and both spore forms are found side by side in the 

 same cavity, it is difficult to be certain on this point. Both 

 kinds of spores appear to arise simultaneously. 



The most highly differentiated spore form (Pi. V, Fig. 1), 

 consists of brown, elongated cells, rounded at the ends, 

 unicellular or with one or two transverse septa, usuall}^ straight 

 but sometimes curved, the curvature in bicellular spores being 

 occasionally sigmoid. They measure 15-24 V 375 to b fx. In 

 some cultures unicellular spores predominated, in others bicellular. 

 Three- celled spores are the least numerous. Germination occurs 



