OQ2 MOXOGPvAPH OF THE LABOULBENIACE.E 
IDIOMYCES Thaxter. Plate IX, figs. 16-21. 
XXVIII 
Receptacle consisting of two superposed cells, followed by two cells, an anterior and a pos- 
terior, — the posterior cell followed by a vertical series of superposed cells bearing externally 
fertile and sterile appendages in three vertical rows; the anterior cell producing one or 
more stalked perithecia and numerous fertile appendages arising from small cells separated 
from it distally. Perithecia symmetrical with four ascogcnic cells. Fertile appendages con- 
sistinn- of a single series of superposed cells, bearing on one side three vertical rows of flask- 
shaped antheridial cells. Spores once-septate. 
This genus is nearly related to Stigmatomyces, through the structure of its peculiar append- 
ages, which are very similar, except for the presence of three instead of one row of antheridial 
cells. Viewed laterally (fig. 18), it is not possible to determine the number of rows ; but a face 
view, such as is shown in fig. ID, shows the slender necks of the three antheridial cells jiro- 
jecting side by side at regular intervals. The sterile appendages (fig» 20) consist also of a 
series of superposed cells, each producing a single sterile lateral branch. 
The receptacle is somewhat complicated in structure, consisting of four cells arranged as 
above described, the peculiarly differentiated posterior series of superposed cells, which bear the 
appendages externally, recalling, in a way, the primary appendage of Ccratomyccs. The cell 
which produces the perithecia becomes distally divided, usually on one side only, the cells thus 
formed producing the second set of appendages, which, in well developed specimens, may be* 
very numerous and extend almost completely around the base of the stalk-cell of the pcrithecium 
on both sides. Fresh material for a more minute examination of this genus is greatly to be 
desired, since the specimens of the single species which constitute the types are in very poor con- 
dition, w^ith the exception of the one from -which fig. 17 was derived. 
Idiomyces Peyritschii Thaxter. Plate IX, figs. 16-21. 
Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 162. 
More or less tino; 
^ !d with yellowish or amber brown. Receptacle consisting of two super- 
posed basal cells, surmounted by two cells; the outer, having a very thick external wall which 
forms a distmct prominence distally, is succeeded by a row of about five or six superposed, more 
or less flattened cells, extending beyond the base of the stalk-cell of the perithcclum, which 
bear externally three vertical series of closely-set appendngos : tl^e inner is succeeded by a 
smgle rounded cell followed by several small cells, which 
ages variable in number. Appendages mostly fertile, horn"c on one' or" twoIquarTsh'basal cells, 
termmatcd by a simple or once branched short sterile filament. Perithecia short, thick, sub- 
1 give rise to a scries of 
of a single basal 
and two sub-basal cells, the outer directly in contact with the pcrithecium, the inner separated 
from It by two small cells. " Spores, 60x4;.. Perithecia, 110-133x60-70^. Appendages 
longer, 80 /i. Receptacle, 130-165 X 70-95/.. f^ n ^ 
Stalk 
chro 
00/i. 
