RESEARCHES ON FUNGI 



Fig. 130. — A,scobolu.s ituujiiificus. Two vertical .sections tliiough tlie li\-ing hyineaiiim and subh3'menium, 

 to illustrate the heliotropism of the asci. In A the ripe asci h, i, and ./ point vertically upwards toward 

 the source of light wliich illuminated them directly from above, as indicated by the arrows. In B the 

 free ends of the ripe asci h, i, and J are curved toward the source of light which illuminated them 

 obliquely, as indicated by the arrows. A : a, the subhymenium, the contents of the cells are not 

 shown ; b. the hymenium, the contents of the cells are shown by shading. The hymenium consists 

 of slender unbranched paraphyses c, embedded in a yellowish gelatinous matrix d, and of asci : e e, 

 very young asci containing vacuolated protoplasm ; /, a slightly longer ascus with a nucleus near its 

 apex ; g, an older ascus, containing 8 young ascospores, pushing up between the paraphyses ; h, i, 

 and j three ripe asci all pointing in the direction of the source of light and now ready to discharge 

 tlieir spores ; k, a purple spore with a white longitudinal line in view ; 1 1, spores which happen to show 

 tlie external gelatinous meniscus which each spore bears on one side ; m, exceptional spores with 

 roughened walls ; lu a large central vacuole filled with cell-sap ; o, an ascus which has discharged 

 its spores and has collapsed, its open end still projects slightly beyond the paraphyses and its operculum 

 is visible at its apex. B, letters with the same significance as in A. Drawn by A. H. R. Buller and 

 Ruth Macrae. Magnification, 280. 



