MONOGRAPH OF THE LABOULBENIACE^. ??17 
by its pcrithecium, the broad apex of which is peculiarly flattened and bent strongly outward. 
It is comparatively rare, and does not appear to vary to any extent. 
Laboulbenia coxtorta Tliaxter, Plate XV, figs. 1-5. 
Proc. Am. Acad. Arts and Sci. Vol. XXVH, p. 42. 
More or less suffused with reddish brown. Peritheciuni becoming suffused with blackish 
brown, sometimes quite opaque ; outwardly inflated, its tip turned strongly outward, the lip-ccHs 
forming a very broad and characteristic hatchet-shaped apox, its edge becoming almost vertical, 
the whole perithecium somewhat twisted and bent toward the appendages, its axis crossing theirs 
in mature individuals about at right angles. Appendages arising from two basal cells, the outer 
large, elongate, giving rise to a single appendage once branched or simple; the inner half as 
large, producing usually two simple branches, each usually producing a single pair of anthcridia. 
Ecceptacle rather elongate, abruptly expanded above cell 11; colls I-Il forming a long, nearly 
cylindrical, stout stalk, rather abruptly contracted at the foot ; cells IV-V elongated and twisted 
so that the appendages and their insertion cell are often carried across at riglit angles to the 
axis of the perithecium. Spores, 75 x 5 /z. Perithecla, 150-180 X G0-7o/i. Total length to tip 
of perithecium, 330-400 /i; greatest width, 90-100 /a. Appendages about 300 /x. 
On PlatynuB extensicoUis Say, and P. affinis Kirby, Maine to Virginia. 
This curious species is very constant in form, and is abundantly distinct from any otlicr 
species of the flagellaf a type. It is at once distinguished by the hatchet-shaped apex of its peri- 
thecium and the peculiar distortion which grows more marked in older specimens. The species 
is a rare one, and is found almost invariably on the inferior lateral face of the prothorax of its 
host, usually on the right side. 
Laboulbenia gibberosa Thaxter. Plate XV, figs. 6-8. 
proc. Am. Acad. Arts and Sci. Vol. XXVH, p. 43. 
More or less faintly tinged with reddish brown. Perithecium short, stout, expanding slightly 
from the base to a conspicuous external hunch just below its broad, almost truncate apex. 
Appendages arising from a large outer and a very small inner basal cell ; simple or bearing two 
to three branches, always above the sub-basal cell, constricted at the septa, tlie segments becom- 
ing slightly inflated, the tips usually curved and tapering: the disk of insertion small and thick. 
Receptacle elongate, strongly twisted above cell 11, the twist contijiucd by cells IV and V, wliich 
are mucli elongated, and carry the appendages out at right angles to the axis of the perithecium. 
Spores, 50x4.5^. Appendages, 180/^. Perithecla, 125 X 50 //. Total length to tip of peri- 
thecium, 500-550 fx. 
On Platynus extensicoUis^ New England. 
A number of specimens of this rare and singular species show that the twisted receptacle is 
constant character, which is sometimes carried to such an extreme that the ordinary direction 
of the appendages is reversed; the elongation and curvature of cells IV and V bending ihem 
toward the base of the receptacle. The species is large and unusually elongate, growing on the 
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