THAXTER. — MONOGRAPH OP THE LABOULBEMACHJ . 24o 
i 
hers on the abdomen of the host, and eventually are wry evidently injurious in their etleeU, causing tin 
abdomen to become brown and more or less shriveled. I know of no other instance in which an e\ lent 
injury results from the parasitism of any member of the group. In both species the s< \cs an- apt to 
become separated or irregularly disposed, although their oceunvix in pairs is a normal condition. 
DlMKUOMYCES CRI8PATUS Thaxter. Plate XXIX. Figs. 1 I lo. 
Proc. Am. Acad. Arts and Sci., Vol. XXXVI. p. 413. March. 1901. 
Male Individual. Receptacle consisting of four superposed hyaline cells, the basal one much lone, r 
than the rest combined; the upper bearing distally a two-celled terminal appendage, the \o\\* r cell of 
which is small, the upper elongate, brownish; the two remaining cells of th n ptaclc producing cad 
a single antheridium. Antheridia superposed, the stalk-cell, Deck, and venter well distinguished, the 
latter symmetrically and considerably inflated, the neck slightly curved. Receptacle 50 X 8 /*. An- 
theridia 33 X 8-9 [x. Appendage 36 fi. 
Female Individual. Receptacle consisting of usually five sujx'rposed cells, the basal cell very elon- 
gate, slender, and hyaline; while of the four remaining cells the two lower are much flattened, broader 
than long, and separated by oblique septa, the two upper unlike and narrower. Of these four cells the 
second from below gives rise to the stalk-cell of the peritheciuin, while the others by sue* vsive prolifera- 
tion produce each a branch consisting of eight or ten obliquely superposed cells; while each of these 
cells in turn produces a single simple branchlet from its upper side, originally terminal, but becoming 
lateral through the further proliferation of the cell which bears it; the branehlets distinguished by a 
slight constriction and a broad dark septum at the base, brown, curved, distally helicoid, slightly enlarged 
and paler. The primary terminal appendage thus appears as the lowest of the up]wr series of branebleis, 
from which it does not differ in structure. Peritheeia one to three in number, the firsl lowest, and al tys 
formed from the second from below of the four distal cells of the reeeptacle, others sometimes arising 
from each of the two upper distal cells; the stalk hyaline, long mid slender, the venter small, narrow, 
not distinguished from the stalk, becoming brownish, distally slightly inflated, tin Deck Imrt and well 
but not abruptly distinguished; the tip well differentiated, hyaline, symmetrical or nearly s«., shovel- 
shaped or spathulate, swollen at its base, and tapering to the broad, bluntly rounded or nearly truncate 
apex. Spores about 30 X 3.5 p.. Peritheciuin: 70-75 X IS p, the stalk KM25 X 15 ft Receptacle 
basal cell 185-250 X 18 fx, the distal portion about 50 /£. Total length to tip of perithecium 3«) 135 //. 
Lateral cell-series or branches about 50 p long, their branehlets to tip of helix about .V) /£. 
On the legs and superior surface of the abdomen of the same host parasitized by l> marctatm 
Italian, New Pomerania. Berlin Museum, No. 12S2- 
This species occurred very rarely and always in solitary pain on various parts of the host, no in- 
stance being observed in which a male failed to develop at the base of the female. It is more highly 
differentiated than any of the other species in that the upper cellfl of the receptacle proliferate to form 
several appendiculate branches. The species is further well distinguished by its curled appends 
elongate basal cell, and peculiar long-stalked peritheeia. 
1 - 1 3 
Proc. Am. Acad. Arts and Sci. , Vol. \ \ \ V, p. 41 1. 
1900 
superposed cells, the up|K«r 
t«o-celled appendage with dark septa, the subbasal eell giving ri.se to a single small antheridium, tl 
appendage 
15 X 5 u 
Female individual consisting of a main axis of superposed cells from which appendi* ulatc oil, arc 
separated on both sides, the basal cell large and long, narrow. -r below; tl cells above about ten to fif- 
teen in number, usually roundish; the appendage bona- side by side in pairs on both sides of the n ep- 
xi ,, r. ,. *, , ,1 • i __i _„n M »; m ^ m.rv,.<l nrnlna ! hooked distallv, variably 
