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1906] OVERTON—THECOTHEUS PELLETIERI 451 
As will be seen from the description below, the form differs from the 
species of Ryparobius described by BARKER (:03, :04) in having 
several ascogonia instead of a single one. As it may be found that 
this is a character of generic significance, I have thought best to follow 
BoupteR in including this form under a separate generic name. 
The investigation of the Ascomycetes has shown that there are 
great variations in the morphology and development of both fruit 
bodies and reproductive organs, and a sharp distinction may be 
made as to whether the sexual organs, associated with ascocarp 
formation, occur singly or in groups. Below I have brought together 
those forms whose fruit bodies develop from a single ascogonium, as 
contrasted with those whose ascocarps develop from several ascogonia. 
In strong contrast to these may also be added a third group of appar- 
ently apogamous forms, whose fruit bodies develop directly from a 
cell of the mycelium without the appearance of sexual organs. 
I. In the following forms the ascocarps develop in connection 
with a single set of sexual organs: Monascus (BARKER :03, OLIVE 
:05), Dipodascus (JUEL :02), Gymnoascus (BARANETZKY ’72, VAN 
TIEGHEM 76, 77, Erpam ’83, Miss DALE :03), Erysiphe cichorace- 
arum (Sphaerotheca castagnei) (DEBARY 63, HARPER 95), Erysiphe 
galeopsidis (DEBARY ’70), Erysiphe communis (DEBARY 70, HARPER 
96), Sphaerotheca humuli (BLACKMAN & FRASER :05), Phyllactinia 
corylea (HARPER :05), perhaps Eurotium repens, Aspergillus glaucus, 
(DeBary ’70), Penicillium glaucum (BREFELD ’74), Aspergillus glau- 
cus (VAN TIEGHEM ’7'7), Chaetomium (VAN TIEGHEM’75, 76, EIDAM 
83, ZUKAL’86, OLTMANNS ’87), Stictosphaeria Hojfmanni, with sev- 
eral species of Diatrype, Eutypa, Quaternaria, and Xylaria (FUISTING 
67), Sphaeria lemaneae, Sordaria fimiseda (WORONIN 70, GILKENET 
74), and Ceratostoma brevirostre, Hy pocopra sp. (Miss NICHOLS ’96). 
Among the Discomycetes the following investigated forms show a 
single ascogonium: Ascobolus jurfuraceus (JANCZEWSKI 72, HARPER 
96), A. pulcherrimus (WoRONIN ’66), Ryparobius sp. (BARKER :03, 
:04), Peziza granulosa, Lachnea scutellata (WORONIN 66), Humaria 
granulata (BLACKMAN & FRASER :06), Ascodesmis nigricans (VAN 
TiecHeM ’76), and Thelebolus stercoreus (RAMLOW :06). 
Il. Pyronema confluens (TULASNE 66, DEBARY 63, KIHLMAN 
°83, HarpPER :00), several species of Collema (Baur ’98), Parmelia 
