180 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Stalked perithecium, normally solitary, and to a single appendage 

 consisting of a main axis of several superposed cells from some of 

 which ramiferous cells are separated on the inner-side, the branches 

 variously developed, the subbasal cell and sometimes the cell above 

 it bearing antheridial branches; the antheridial branchlets them- 

 selves, which really form the distinctive feature of the genus, some- 

 times associated with sterile branchlets and bearing antheridial cells 

 typically arranged in series of two or more superposed members, one 

 or more of which occupy an intercalary position in the series. That 

 even this character may be obscured, or is at least not always recog- 

 nizable, is evident from an examination of the peculiar series of forms 

 parasitic on species of Siilicus of which several additions are herein 

 included. Although in more than one species of this very individual 

 and peculiar group of forms, the seriate arrangement is well marked, 

 instances occur in which it is rarely or perhaps never present. Thus 

 in Corcihromyces Stilicolus, which I formerly referred provisionally 

 to Siichornyces, it is only after the examination of much additional 

 material, that examples have been found in which the characteristic 

 seriate arrangement occurs, the antheridia usually tending to become 

 solitary or at least free, even when grouped: although in the light of 

 further knowledge of this type there can be no question that it is 

 congeneric for example with C. Sfilici and others of this series, in 

 which one or more of the antheridia may be intercalary. 



The conclusion thus seems unavoidable that both Rhadinomyces 

 and Sphaleromyces should no longer be maintained as distinct genera, 

 but should be merged in Corethromyces, which, in addition to the 

 species previously described under this name and the new forms 

 described below, may be regarded as embracing the following spe- 

 cies: Corethromyces cristatus and C. pallidus formerly placed in 

 Rhadinomyces; C. Stilicolus formerly included in Stichomyces; C. 

 Lathrobii, C. occidentalis, C. Indicus, C. atropurpureus, C. 

 Brachyderi, C. Chiriquensis, C. Latonae, C. obtusus, C. pro- 

 pinquus and C. Quedionuchi formerly placed in Sphaleromyces. 



That further changes in the disposition of the last mentioned forms 

 may become necessary, when better material of the other species 

 related to C. Quedionuchi has been examined, is suggested by the 

 characters of the new genus Mimeomyces described above, which are 

 exactly those of the group referred to, except for the presence of well 

 developed compound antheridia. C. atropupiireus, for example, might 

 well belong to the new genus, but in the type material, no signs of 

 compound antheridia can be found. 



