196 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
are borne singly along the sides of a sporopliore, only occasionally 
forming oidium chains (pi. 19, fig. 28-32). In this species the spores 
should undoubtedly be ranked as conidia although with oidium 
affinities. 
A similar approach to conidia is seen in the case of chlamydospores. 
In species of Ptychogaster, and particularly in Fistulina, the chlamy¬ 
dospores are grouped on branching hyphae and in external appearance 
closely resemble clusters of conidia. However, the closest approach 
to the status of conidia is seen in Michenera artocreas, where the for¬ 
mation of the spores is typically chlamydosporic (see p. 155), but they 
have assumed an habitual subterminal position in the parent hypha, 
and are formed in a highly developed fructification of their own with 
a definite hymenium, facts which ally them to higher types of spores. 
The writer therefore is of the opinion that the oidia and the chlamy- . 
dospores of Hymenomycetes are morphologically distinct and are 
not modifications of the same structure. 
Bulbils. — Sclerotia have long been known among the Basidiomy- 
cetes, as in Coprinus stercorarius , species of Typhula, etc. Many 
species also possess sclerotioid growths of a less definite character 
than those mentioned above, while rhizomorphae and other enduring 
structures are common. It is not the purpose of the present paper 
to attempt any discussion of these forms with the exception of the 
small definitely formed bodies which Eidam named bulbils, and 
which are, in some instances at least, sclerotioid in their nature. 
Bulbils are now for the first time reported among the Basidiomy- 
cetes; one species is definitely connected with Corticium alutaceum, 
and the basidiomycetous nature of two other forms is demonstrated, 
although they are not specifically located. In examining the litera¬ 
ture bearing upon bulbils there appears a great confusion due to the 
conflicting opinions of those who have observed these forms. This 
confusion the writer cannot attempt to set straight, but a brief review 
of other known species may assist in the understanding of those with 
which this paper deals. 
A considerable number of species of bulbils has been described 
and usually placed tentatively in the genera Helicosporangium and 
Papulospora. The method of formation varies. In Helicosporangium 
parasiticum H. Karst., Helicosporangium coprophilum Zukal, Papulo¬ 
spora dahliae Cost., and most other species, a short branch rolls up 
spirally in one plane, and the terminal (or subterminal) cell of the 
