THE GENUS CHITONIELLA. 110 



and the developing stalk, and this appears to be accentuated- 

 in tropical forms. This intermediate tissue is so well developed 

 that the veil may be 5 millimetres thick, and with variations 

 in weather there result variations in. dehiscence which con- 

 vert one species into half a dozen. For example, Psalliota 

 bolorhiza, B. & Br., has a thin fragile veil and a stem clothed 

 with large floccose warts, or a thick warted fragile veil and a 

 smooth stem, or in cases where the veil tissue is not so strongly 

 developed, the stem may be smooth and the veil firm and rigid. 



Ths gills of Chitoniella poderes are widely free from the stem, 

 rather narrow (about 7 mm. broad in large specimens), equal, 

 at first white, then greenish. The spores are olive-green in 

 mass, and pale green when magnified, elhptic, with a large, 

 sublateral apiculus (" pip-shaped "), 6-8 X 3-5-4 m. 



The under surface of the pile us is produced beyond the inner 

 ends of the gills, and forms a translucent ring occupying half 

 the space between the gills and the stalk. This ring is 

 frequently, but not always, crenate. 



The synonymy runs as follows : — 



Chitoniella poderes (B. & Br.) , P. Henn. (1898) 



= Psalliota poderes, B. &Bv. - (1875) 



= Psalliota pedilia, B. & Br. (1875) 



= Psalliota trachodes, Berk. (1847) 



= Chitonia poderes (B . & Br . ) , Sacc . ( 1 887 ) 



= Chitonia pedilia (B.&Bv.),Ssi,<iG. (1887) 



There is at present no recognized position for green-spored 

 agarics in the classification of the group according to the 

 mass-colour of their spores. Black, purple, ochraceous, pink, 

 and white are supposed to be able to cover all shades of colour 

 which can occur. The attempt to force all spore colours under 

 these five heads does not give very satisfactory results in the 

 case of tropical species, and it seems probable that as our 

 knowledge of tropical agarics is extended by observations on 

 hving specimens, and the colour of the spores is observed free 

 from any discolouration by contact with the dying pileus, it 

 will be necessary to institute other groups, or to classify by 

 means of other characters. In this connection, it may be 

 stated that the colour of the spores shed by an agaric which is 



