7 
the Genus Cordyceps. 
species of Cordylia is morphologically identical with that of 
Cordyceps ; the generic distinction turns on the absence of 
a true, compact sclerotium, and in being parasitic on subter- 
ranean species of fungi. Finally, the genus Corallomyces is in 
absolute morphological agreement with the ascigerous portion 
of those species of Cordyceps having large superficial perithecia, 
but differs in the absence of a sclerotium, and in being a true 
saprophyte. 
The numerous forms of Isaria having no associated 
ascigerous stage have not been dealt with. 
Hosts. 
As defined in the present w6rk, all the species of Cordyceps 
grow on insects, and have been recorded as occurring on 
representatives of the following Orders : Hemiptera, Diptera, 
Lepidoptera, Hymenoptera, and Coleoptera. The larval 
condition of the insect is the most frequent host, especially 
such as bury themselves in the ground or amongst moss or 
vegetable debris , but different species occur on every stage 
of insect development ; fewest being known to occur on the 
adult or imago condition, which however is by no means 
exempt from attack. Our knowledge respecting the various 
hosts is very incomplete, owing to their being in many 
instances beyond certain recognition when the fungus shows 
itself ; and again, until recently it was considered sufficient to 
state that the fungus was parasitic on a chrysalis, caterpillar, 
moth, &c. 
Gray 1 appears to have been among the first to attempt 
a determination of the various insects attacked by parasitic 
fungi, and to his researches we are indebted for the deter- 
mination of certain hosts given under their respective para- 
sites. The hosts are also enumerated, so far as determinable, 
in the excellent ‘ Host-Index ' by Farlow and Seymour 2 . 
1 Notices of insects which are known to form the bases of fungoid parasites. 
A Memoir, privately printed. London (1858). 
2 A Provisional Host-Index of the Fungi of the United States (1890-91). 
