268 THAXTER. — MONOGRAPH OF THE LABOULBENIACE^. 
lava. No. 534. In the Sharp Collection; on PJwropsophus sp., from Japan. In the Berlin Mus 
parallel us Dej., Senegal; on P. Madagas 
on P. Kersteni, 
Anisclia Kisuani, Africa, No. 998; on P. marginatum Dej., Africa, No. 999; on P. fastigiatus, Cape of 
Good Hope; on Pheropsophus sp., Ceylon, No. 1006. The generic type appears to be an isolated one, 
and in the Key I have included it in a section by itself, although it is closely related to the Peyritschiellea\ 
MONOICOMYCES Thaxter. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 412. April, 1900. 
Receptacle consisting primarily of two superposed cells terminated by a sterile appendage which is 
V 
typ 
speciefl several, branches or secondary receptacles, which may consist of one to many superposed cells 
and may he simple or branched; giving rise to antheridia and perithecia which may or may not be also 
associated with sterile appendages. The antheridium consisting of four tiers of paired cells, the lower 
pair forming the stalk, the cells of the two middle pairs producing each a pair of antheridia from their 
upper inner angles; those of the distal pair cutting off paired sterile cells which correspond to the paired 
antheridia below, and one or all of which give rise to variously developed, simple, cellular, terminal, 
terile appendages: the four pairs of antheridia opening into a common central cavity which discharges 
between the sterile terminal appendiculate cells. Perithecium stalked. 
This is one of the most peculiar and interesting of the genera of Laboulbeniacese and is extremely 
variable in the general structure and relations of the fertile branches or secondary receptacles; a varia- 
bility which is well illustrated by the conditions seen in M. St. Helena and M. Leptochiri. The char- 
acter, of the peculiar antheridium appear, however, to be quite constant in all the species; although, in 
t few instances, it seems possible that the two middle tiers of cells may produce more than four antheridia 
uh. The curious sterile terminal appendages of this organ are also very variable in their development, 
both as to Dumber and length, and the cells from which they spring are evidently homologous with the 
antheridia, which are separated in a similar fashion from the cells below. It will be observed that a more 
detailed study of these forms has necessitated important modifications in the original diagnosis. 
The hosts of this genus all belong to the Staphylinida?, a majority of the species occurring on the 
Aleocharini. 
Mox 
Plate XXXV, figs. 8-10. 
April, 1900. 
- ~v «—. ^. Ana aim oci., vol. iS.AAV, p. 412. April, 1900. 
Receptacle consisting of very small hyaline basal and subbasal cells, the basal cell of the primary 
appendage short and stout, more or less deeply suffused with blackish brown externally and at the base, 
the ceH above »t, bearing two or three branchlets in an anteroposterior plane, the primary (terminal 
and external) one short and externally suffused with blackish, the lower cell larger and distally inflated, 
lert.le branches normally two when the individual is bilaterally symmetrical, rarely three, consisting of 
a mi* cell which bears chstally an antheridium from its outer and a perithecium from its inner angle. 
^ iVT/T >r T' *** ^ mmetri ^> lively very large, short and stout; the lower half 
1 t 1 n . *T ? m T " ° n thC °" t( ' r than the in,ler ^ **M\y conical, the small tip not 
^nttTEL?"ft trU r te ' tHe Stalk - CeI1 *■** "Knowing to its base. Antheridium 
of the h ."I " Sh0rt , sta,k - Cd,s ' the «* >* the second tier somewhat smaller and angular, 
■PM&l^^ " TlT* T*" ** th ° Se ° f * e * econd > but ** *n<l ^nct, the paired 
i • " k e ^ m TT f r e terminal t5rr ' relative ^ h ^> a11 four f-«^ ^ ** 
IS^^Xt :\rr ] length - Spores ** ^ * 3 * *^- **■*■? basai 
SZ ^ ^^^£ti ^JLJf*™* "*• ^-^ M the terminal pro- 
Homalota 
Sterile part of receptacle about 70 p.. 
Homah 
Intervale, N. R, and Kitteiy Pt, Maine. 
On inferior surface of abdomen. 
