66 



RESEARCHES ON FUNGI 



thicker than that of the Coprinus Type. This difference is at once 

 apparent when one compares a median vertical section of a fruit- 

 body of Coprinus atramentarius (Vol. Ill, Fig. 118, p. 278) or of 



1. 



J- 



Q> 



OTnin, 1 mm. Zmm, <3fli7n<, 



Fig. 41. — Relative shape and thickness of gills seen in cross- 

 section, shown somewhat diagrammatically. A, Coprinus 

 atramentarius, as an example of the Coprinus Type (the 

 bridging cystidia omitted). B, Collybia platyphylla and C, 

 Psalliota campestris, as examples of the Non-Coprinus Type. 

 The arrows in B and C show the trajectories of a few spores 

 discharged from the hymenium in still air. Magnification, 8. 



C. comatus (Fig. 46; also Vol. I, Plate I, Fig. 1) with a similar 

 section of Psalliota campestris (Vol. I, Plate I, Fig. 2) or of Marasmius 

 oreades. 



A Psalliota campestris fruit-body 8 cm. in diameter was com- 

 pared with a Coprinus comatus fruit-body 12 cm. high. It was 

 found that : (1) the hymenial area on the gill surfaces was about 



