436 TIIAXTKIl. — MONOGRAPH OF THE LABOULBENIACE^ 
A . i.ml tr r<> u | > of forms which, from the fact that they are all parasitie on species of a single aquatic 
genus, />'"•"* may be appropriately called Autoicomyces, is represented by the six described forms 
shove enumerated, and a seventh as yet unpublished. The members of this section differ from Cera- 
towijre* iii having a small and determinate number (seven and eight) of wall-cells in the perithecia. 
The third group, of which the form previously described as C. rostratus may be taken as the type, I 
have ealled Ithynchophoroniycet from the monstrously developed necks which characterize the perithecia 
of the species. The receptacle in this genus is many-celled and indeterminate, the perithecium distin- 
guished into neck and venter, and later confluent with the base of the appendage, and at maturity its 
axis is coincident with that of the receptacle. 
Lastly the two species formerly described as C. rkynchophoms and C. refiexus, together with two or 
thro others as y<t unpublished, appears to differ very widely from all the other types, possessing a straight 
nil ;i\is of many superposed cells indeterminate in number, from which the perithecium, the wall-cells 
of which are few in number and determinate, arises laterally. This type is further distinguished by the 
production of what at least appear to be definitely differentiated antheridial cells, which are produced 
much a in Ect nomyces with which it has been provisionally associated above. To this genus from its 
tquatic habit and parasitism on the rJydropbilidse I have given the name Hydrophilomyces. 
Of tin _ roups Avtoicomyces corresponds in all respects to Ceratomyccs, except in its determinate 
perithecium, and is perhaps too closely allied to this genus. There can hardly be a difference of opinion, 
however, I to the desirability of separating the others. 
Emended as above indicated, the genus Ceratomyccs may be characterized as follows: 
Receptacle consisting of three superposed cells above the foot, surmounted by a pair of cells which 
form the bases of the perithecium and of the appendage respectively. Cells of the perithecial wall- 
rows indeterminate, both in different species and individuals: perithecium usually appendiculate below 
the tip. Primary appendage consisting of a variably developed series of superposed cells, the lower 
members of which may become longitudinally divided, and some or all of which may bear secondary 
branched appendages arising from ceils separated from their upper inner angles. 
This is a typically American genus, all the species of which, with the exception of the doubtful 
C.terrutm found on Lathrobium, occur on specie's of the single hydrophi lid genus Tropistcmus and the 
allied Pkvrohomus in North and South America. The species vary very greatly in the number of mem- 
ers which compose the rows of wall-cells in the perithecia, the extremes in this respect being well illus- 
xeep.mn of the anomalous C. trrrestris to which reference has been made above, and C. filiformis, are 
character./, (1 by the possession of a subterminal perithecial appendage variably developed. 
Ceratomyces filiformis Thaxter. 
1 his species which usually occurs among the bristles along the margins of the elytra of its host near 
"><• tip. is al>o found not infrequently between the terminal claws of the posterior leg. Material has been 
examined Iron, hnstis, Florida ami spcimens have been obtained from Mexican Tropisterni in the Paris 
1 ZT^l ' >U; l " n Pknro, " mm oh « c " r "» Sharp from Duefla, Guatemala; Sharp Collection, No. 
■». .s somewhat anomalous and less well marked than any of the other species, seldom shows the 
presence ot branches on its appendage, produces very few spores and varies greatly in the length of its 
pentheemm a nd m the numbers of cells which compose it. 
Ci -IRATOMTCES PBOCERUS Thaxter. Plate LXIX, fig. 6. 
R , J r0C - Am - Acad " Arts and ScL, Vol. XXXVII, p. 43. June. 1901. 
-all-cells' in clel row" liTE. SS*"^ t^*' ° f "^ eC l Ual diameter throughout, the 
con 
