PSATHYRA URTICAECOLA 



^33 



bitius is sharply marked off from the genus C'oprinus, and, secondly, 

 that Quelet and Lange had no sufficient grounds for removing 

 Psathyrella disseminata and P. inipatiens from the genus Psathy- 

 rella and transferring them to the genus Coprinus. 



Up to the present in this work the generic positions of PsatJiyra 

 urticaecola and of Coprinus plicatilis have not been discussed. I 

 therefore propose to analyse the fruit-bodies of these fungi in the 



Fig. 54. — Coprinus urticaecola. Fruit-bodies coming up on a stick found in Kew 

 Gardens. Spore-discharge about to begin. Photographed at 4 p.m., June 22, 

 1912. Natural size. 



light of the seven already-mentioned criteria. The result will show 

 that the Psathyra must be transferred to the genus Coprinus and 

 that Coprinus plicatilis must be retained as a Coprinus. The 

 remarks which now follow are quoted with but slight alterations 

 from a special paper published in 1917. ^ 



Psathyra urticaecola, — Whilst hunting for fungi in Queen's 

 Cottage Grounds at Kew, Miss E. M. Wakefield and I found this 

 species growing on sticks (Figs. 54 and 55) and other rubbish which 

 had been dredged from the large lake in the Royal Gardens, and 

 also on dead leaves and haulms of Holcus lanatus. On one stick 

 there were from twenty to thirty fruit-bodies which at the time 



1 A. H. R. BuUer, loc. cit. 



