THAXTER. MONOGRAPH OF THE LABOILBKM ACK.K. 'Si) 
■K- 
Museum on Diopsis sp. from East Africa No. 738. In the last mentioned sj>eciincns the tips of th< 
appendages are characteristically helicoid, being curved downward instead of upward, as is mora often 
the case. 
iovsis 
tenuipes some of the specimens an very elongate, nearly a milli- 
meter to the tip of the perithecium, and the rather rigid appendages project nearly at right angles t<> ihe 
axis of the receptacle. The species is curiously near to L. cristata, hut is very well marked and distinct 
LABOULBENIA falcata Thaxter. Plate LXY, fig. 12. 
Proc. Am. Acad. Arts and Set., Vol. XXXV, p. 175. Dec, 1809. 
Perithecium free or nearly so, mostly very large, pale yellowish, the inner half or more suffused with 
smoky brown, darker toward the margin, the base more or less strongly curved so thai the perithecium 
is directed outward nearly at right angles to the axis of the receptacle or even recurved, basal I y inflated 
along the inner margin, tapering gradually from about the lower third to the apex; tin- tip not differen- 
tiated from the body of the perithecium, the lip-cells with darker longitudinal brown shades the outer 
more prominent, hyaline, notched; the inner rounded, brownish. Receptacle short, straight or nearly 
so, the basal cell broad, sometimes slightly inflated, a slight constriction often present between erlls II 
and III, all the remaining cells unusually small in proportion. Outer appendage consisting of a small 
rounded basal cell bearing a single branch separated from it by a blackened constricted septum and con- 
sisting of a hyaline externally blackened basal cell bearing two branchlets; an outer externally blackened 
and bearing several vertical branchlets; an inner usually simple, hyaline or yellowish- Inner appendage 
consisting of a basal cell similar to that of the outer or slightly smaller, producing a branch on cither side, 
each usually branched, all the branches pale yellowish with occasional brown suffusions, the longest not 
greatly exceeding the tip of the perithecium. Spores 35X3 ft. Perithecium 150-200 X i> 55 ft. 
Total length to tip of perithecium 275-380 ft; to insertion-cell 140-190 fL Width 31- M) p. Appendage 
175-275 
Mns 
Brazil. 
A well marked species, chiefly peculiar for the large size and unusual form of its perithecium, which 
is twisted so that the inner and outer lip-cells are lateral in position. The outer lip-cells project slightly 
above the inner, and form a characteristic sulcate somewhat asymmetrical apex. The material is some- 
what scanty and for the most part in bad condition. No specimens show the form and arrangement of 
the antheri'dia, yet the species appears to be most nearly allied to L. cquatonalis, which also occurs on 
Casnonia in Brazil. 
Laboulbenia equatorialis Thaxter. Plate LXV, figs. 10-11. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 174. Dec, 1890. 
Perithecium free, hyaline becoming tinged with brown, slender and elongate; the basal wall-cells 
forming a well marked though not clearly differentiated hyaline stalk; a median and subt< -rimnal external 
prominence; the rather broad tip more or less deeply tinged with blackish brown, rather abruptly differ- 
entiated and bent outward, the lip-edges hyaline, the inner lip-cells prominent, more deep y suffused. 
Receptacle very long and slender, cell I short, cell II greatly elongated, cells III and M about equal. 
Insertion-cell bro. i, deeply blackened. Outer appendage consisting of a somewhat rounded ha al cell, 
which is hyaline externally, distally suffused with blackish brown, and bearing two branches antero- 
posteriorly; the outer of which consists of a nearly isodiametric basal cell, becoming opaque except its 
upper inner angle, from which arise two branches; the inner simple, becommg red-brown, distinguish,,! 
by a broad black septum, the outer consisting of a small basal cell, opaque, except its inner upper hyaline 
angle, and bearing two branches; an inner dark red-brown and slender, an outer curved outward and 
upward, more slender, deep red-brown, opaque toward the base, the inner branch from the basal eel I »1 
the outer appendage consists of a basal cell like that of the outer branch, which bears distal^ tw 
branches, red-brown, about eaual, the lower two cells inflated inward. The mner appendage consist 
