MIMICRY. 341 



there is an imitator in a small fungus with white 

 spores, found in just the same localities, with the 

 identical fishy odour. According to all authority 

 and experience the difference in the colour of the 

 spores is not a mere difference of species, but indicates 

 quite a separate and distinct group of species. 



We might also indicate as further removed from 

 each other such species as Agaricus (Jricholoina) midns, 

 a handsome violet species, which when well grown is 

 scarce to be distinguished from Cortinarius violaceus, 

 except that in the former the spores arc white, and in 

 the latter rusty. 



Taking a still wider range we encounter equally 

 startling resemblances between widely separated 

 groups, such as the whole hypogceous Gasteromycetes, 

 which in form, size, odour, habit, and all save fructi- 

 fication imitate the truffles {Tuberacece). Or, opposing 

 certain genera we have in Podaxon a resemblance to 

 Coprimis, and Hypolyssus might be mistaken for an 

 immature Crucibtdwn. The larger species of Peziza 

 sometimes approach in habit Craterellus. And in 

 CypJiclla, with its naked spores, every feature besides 

 corresponds with the small Pezizce, some being like 

 the section Hymenoscypha, others that of Dasyscypha, 

 and others Mollisia. 



Comparing fungi with other cryptogamia, the gela- 

 tinous species of Treviella are just like such algae as 

 Nostoc. In lichens the species of Lecidca approximate 



