THAXTER. — MONOGRAPH OF THE LA BOILBEN1 AXJE-K. 327 
This species is doubtfully separated from S. obtum* on account of the \<n different con format ion 
of the tip of the perithecium, which, as the materia] in either case occurred in the same position on tin- 
host, can hardly be due to position of growth. Their retention as distinct species is, however, only pro- 
visional. 
CERAIOMYCES Thaxter. 
Proc. Am. Acad. Arts ami Sci., Vol. WW I. p. 410. March, 11*01. 
Structure of the perithecium as in Laboulbnu'a, its stalk-cell united to the free base of the free stalk- 
cell of the appendage, which bears a well differentiated insertion-cell terminally, from the end of which 
are borne antheridial branches, their successive cells producing terminally either successive secondary 
branchlets, or antheridia or both. Receptacle two-celled. 
This genus is in some respects very similar to Laboulbenia, with species of which it might !>c confused 
on superficial examination. It differs in possessing an appendage, the stalk-cell of which is free from the 
stalk-cell of the perithecium. The main appendage, moreover, consists of but two superposed tells 
terminated by an insertion-cell which does not necessarily give rise to outer and inner branches. As in 
species of Dimeromi/ces and Rhizomyces, the two forms herewith illustrated differ in their relation to tht 
host; C. Dahlii, which grows on a soft-bodied fly, being characterized by a copiously branched rhisotd 
that enters the body cavity, whereas 0. Science is attached by the usual blackened foot. 
Ceraiomyces Dahlii Thaxter. Plate XLI1I, figs. 3-6. 
Proc. Am. Acad. Arts and Sci., Vol. XXX VI, p. 410. March, 1901. 
Perithecium large, blackish brown, with an olive shade, becoming opaque, usually slightly curved, 
tapering gradually to the slender undifferentiated tip; the anterior lip-cells forming two appress I hyaline- 
tipped finger-like projections; the base very broad, translucent, dull brownish, bulging conspicuously 
below the venter, especially on the left side; the stalk-cell mall, marly isodiamctrie, united on its inner 
side to the base of the stalk-cell of the appendage. The latter five, though often in coated with the 
br.se of the perithecium, dull blackish olive, outwardly inflated, narrower terminally where it bean the 
characteristically differentiated basal cell of the appendage, which become^ almost opaque and is some- 
what flask- or bottle-shaped with a rounded extremity, from which, typically, two diverged brand 
arise which in turn may branch one to three times subdichotomously; the Ion- slender flask-shaped 
antheridia borne, one to two together, distally from the successive cells. The 1, al cell of the t eptade 
nearly spherical, penetrating the host by a long filament which is slender except for an enlargement im- 
mediately below the integument of the host, simple at first but becoming more or le copiously branched 
the upper cell very large and elongate. Spores about 30 X 3 ft. Perithedum 275-310 X 5-> <>(> n- the 
2 X 58-68 ft. Appendage 75 So n (the basal • 11 18 X 12 /<), <l 
,t,,U 17.V-940 y 35 a fthe basal cell 20-22 ft). Total lenglh to tip 
68- 
stalk-ccll 40-45 X 18-22 fi. Receptacle 175-240 X 35 ti (the basal cell 
of perithecium 400-675 jx, average 550 [i. 
On various parts of a small flower fly. Balum, New Pomerania. Berlin Museum, N< I2M and 
This species is conspicuous from its large sue and dark color, ami growing, as it often does, pro}. ..in, 
forward front the head of its host, was at first mistaken for an antenna. The many pecuhanttes of ,1ns 
1208. 
fine species need hardly be po 
the specimens the black insertit 
after Dr. Dahl of the Berlin ] 
Laboulbeniales were obtained. 
In all 
Ikvii named 
oil 
Ceraiomyces Selix.e Thaxter. Plate XL1II, figs. 7-8 
Proc. Am. Acad. Arte and Scl., Vol. XXXVm, p. 20. June, 1902. 
Receptacle pale dirty brownish, becoming gradually somewhat broad,- di aUy * "^££ 
brown, not clearly distinguished, the subbasal cell longer than the bum. SUlk- I of the ,k nth- 
