THAXTER. 



MONOGRAPH OK Til 10 LA H( )V \A', ION I A( ' 10.10. 



Museum on Diopsis sp. from East Africa No. 738. In the las! mentioned specimens the tips of the 

 appendages are characteristically lielicoid, being curved downward instead of upward, as is more often 

 the case. In the material on Diopsis Inniiprs some of the specimens are very elongate, nearly a milli- 

 meter to the tip of the perithecium, and the rather rigid appendages project nearly at right angles to the 

 axis of the receptacle. The species is curiously near to L. nistala, but is very well marked and distinct. 



Laboulbenia falcata Thaxter. Plate LXV, fig. 12. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 175. Dec, 1899. 



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 that the perithecium 

 is directed outward nearly at right angles to the axis of the receptacle or even recurved, basallv inflated 

 along the inner margin, tapering gradually from about the lower third to the apex; the 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 cells 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 either side, 

 each usually branched, all the branches pale yellowish with occasional brown suffusions, the longest not 

 greatly exceeding the tip of the perithecium. Spores 35 X 3 //. Perithecium 150-200 X 35-55 p.. 

 Total length to tip of perithecium 275-380 ft; to insertion-cell 140-190 p. Width 3-4-40 (i. Appendages 

 175-275 /i. 



At the base of elytra and on superior prothorax of Casnonia sp., Paris Mus. No. 116 bis, Bahia, 

 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 antheridia, yet the species appears to be most nearly allied to L. equatorialis, 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, 1899. 



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 subterminal 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 deeply suffused. 

 Receptacle very long and slender, cell I short, cell II greatly elongated, cells III and VI about equal. 

 Insertion-cell broad, deeply blackened. Outer appendage consisting of a somewhat rounded basal cell, 

 which is hyaline externally, distally suffused with blackish brown, and bearing two branches antero- 

 posterior^; 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, becoming red-brown, distinguished 

 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 cell of 

 the outer appendage consists of a basal cell like that of the outer branch, which bears distally two 

 branches, red-brown, about equal, the lower two cells inflated inward. The inner appendage consists 



