280 MOXOGKAPH OF THE LAB0ULBE2^IACE^ 
pEyniTSCii 
Plate IV, figs. 7-8 and 24 
Proc. Am. Acad. Arts and Sci. Vol. XXIX, p. 101. 
Hyaline. Receptacle asymmetrical, consisting of a single basal cell followed by three succes- 
most 
sivc, more or less definite, transverse rows of cells. 
and irrc«nilar, consisting of from two to four cells, one of which, larger than the rest, is an axile 
om 
it on one side, each successive cell smaller and placed higher in the series, the outermost and 
uppermost bearing one of the sterile appendages characteristic of the genus. The second row 
also consists of a larger median cell, which is free for a short distance on one side, and on both 
sides of which are cut off, as in the first row, from two to four cells, the smaller uppermost ones 
on both sides giving rise to from one to three appendages, according to tlie numher of the cells. 
The upper row is either symmetrical or asymmetrical, according as it gives rise to two or to only 
one perithecium. In the first instance it consists of a median cell, above which arc produced 
two sterile appendages, and a variable number of cells cut off laterally as in the lower rows, but 
nearly symmetrical in size and shape, the outermost bearing sterile appendages. If one perithe- 
cium only is produced, the row is asymmetrical, and a greater number of appendages appear 
on uue side of the perithecium than on the other. Perithecia very slightly inflated near the base, 
tapering abruptly but slightly to the spreading apex, which is four-lobed, the lobes rounded, 
large and prominent. Spores about 37 x 3.7 /i. Perithecia, 75-80 X 18-22 /*. Total length to 
tip of perithecia, 220-260 /* (150 ^ in specimens from the smaller host). 
On Fterosticlius luctuosus Be]., P. erytliropus Dej., and P. patruells Dcj., Kittcry Point, 
Maine ; Arlington, Mass. 
Unlike the other species, this form not infrequently produces two perithecia, the arrangement 
of its distal cells in such cases closely resembling that of Dichomyccs. The main body of the 
receptacle is, however, asymmetrical, and the anthcridium occurs only on one side. 
It is distinguished from the preceding species by its more slender form, smaller and shorter 
appendages and perithecia, and especially by the division of the sub-basal cell of its receptacle 
to form an incomplete transverse series, or rather half-series, of cells. Its anthcridium is small 
and inconspicuous, occurring on one side as in the other species. It may be found gi-owing on 
the inferior surface of the prothorax near its anterior margin, and on 'the adjacent posterior 
margin of the prothorax, as well as on the anterior legs. In the last position the individuals be- 
come very considerably distorted in form, and in such specimens several instances have been 
observed In which perithecia were developed from the lower and middle transverse series of cells 
on the right side (opposite the antheridiura). 
The species is a rare one, though the hosts which it infests arc not 
or in rubbish near the margins of ponds or streams. 
uncommon under 
Peyritschiella minima Thaxter. Plate TI fio-g iQ_oi 
Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 266. 
Iljalino or slightly yellowish. Perithecia somewhat asymmetrical, large, stout, tapering 
rather abruptly to the blunt apex, which terminates in four not very prominent, nearly symmctri- 
