PSATHYRELLA DISSEMINATA 



35 



directly on the bark free from the soil. It was observed that, where 

 this was the case, the crevices of the bark were filled with a red 

 mycelium which grew out to the exterior, as shown in Fig. 21, B and 

 D, so as to form little red mycelial tufts. From such tufts the 

 fruit-bodies eventually originated. The lower half of the stipe of 

 one fruit-body is represented at B, 6. 



Fig. 21. — Psathyrella disseminata. Relations of ozonium with fruit-bodies. A, 

 fruit-bodies attached to ozonium running through interstices of soil, B, 

 surface view of a piece of bark with tufts of ozonium, a ; b, base of fruit-body. 

 C, ozonium strands obtained from soil of A. D, cross-section of B showing 

 ozonium tufts, a. E, part of the ozonium shown at C enlarged. F, ozonium 

 hyphae from E ; a, a single hypha ; 6, two hyphae in union ; c, a single hypha 

 branching. A — D, natural size ; E, magnified 72 ; F, magnified 707. 



The red mycelium under favourable circumstances, in addition 

 to growing subterraneously in the manner which has just been 

 described, can grow over the surface of the ground to a slight 

 extent. A year after the observations represented by the photo- 

 graphs in Figs. 18 and 19 had been made, I found another inverted 

 stump about which, up to that time, no fruit-bodies of Psathyrella 

 disseminata had appeared. The soil around the stump was bare and 

 also dry, for no rain had fallen for a considerable number of days. 



