414 



THAXTER. MONOGRAPH OF THE LABOULBENIAC EJE. 



its base externally, and often on only one side, several secondary unmodified prominences arise, each pro- 

 ducing usually a single terminal branch. The inner basal cell moderately distinct, at first simple, later 

 apparently divided or lobed and bearing several branches. All the branches hyaline, constricted at the 

 lower (four to about six) dark, mostly oblique septa; the distal portion slender, elongate, subrigid, taper- 

 ing, without constrictions or colored septa, the basal segments bearing numerous typical flask-shaped 

 antheridia. Spores 70 X 4.5 fi. Perithecia, average 100 X 38 /«. Total length to tip of perithceium 

 average 220 ji; to insertion-cell 150 /i; greatest width 30 /*. Appendages, longest 175 //. 

 On Gijrcics 1 sp., Paris Museum, No. 106, Venezuela. On elytra. 



Abundant material of this species has been examined, and it appears to be very constant in its char- 

 acters. The perithecium lacks entirely the peculiar modifications that distinguish nearly all the other 

 members of this aquatic section of the genus, and corresponds in form, structure and appearance to that 

 of the most typical "terrestrial" species. While the appendages, both in their general character and 

 method of origin in connection with a sterile elevation, correspond to the conditions seen in the more 

 pronounced aquatic types, it is the only one of these thus far examined in which typical single flask-shaped 

 antheridia are readily recognizable and abundantly developed (fig. ID). In fact I have as yet been unable 

 to satisfy myself concerning the antherida in any other aquatic species, a fact which may in part be due 

 to the poor condition in which these forms are usually obtained. 



Laboulbenia Cubensis Thaxter. Plate LXVI, figs. 11-13. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 169. Dec, 1890. 



Perithecium short and stout, free except at the base, slightly curved toward the appendages, blackish 

 olive, the lip-cells prominent but flattened backward and outward. Receptacle elongate, cells I and II 

 dirty olive, cell III hyaline, long, contrasting with cells IV and V, which, together with the basal cells of 

 the perithecium, are deeply suffused with blackish olive; cell VI as long as cell III and lying beside it, 

 becoming tinged with dirty olive; basal cells of appendages dark olive, indistinguishable, producing con- 

 colorous prominences which give rise to a number of hyaline branches, the basal cells of which are large, 

 swollen distally, and bear numerous terminal and subterminal branchlets externally; the branchlets once 

 or twice branched, the septa olive. Perithecia 155-190 X 75-85 fi. Total length to tip of perithecium 

 4S0-800 Appendages, longest 140 [i. 



Tip of abdomen of Dineutes hngimanus Oliv., Paris Museum, No. 101, Cuba. 



This species, of which only three specimens have been examined is distinguished by the ear-like modi- 

 fication of the lip-cells (fig. 12) and the numerous appendiculate upgrowths from the insertion region. 

 It has no close allies in this section, though perhaps as nearly related to L. constricta as to any other species. 



Laboulbenia constricta Thaxter. Plate LXVI, figs. 16. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 167. Dec, 1899. 



Perithecium more than one half free, short, stout, inflated, somewhat olive-brown, the tip not differen- 

 tiated, one of the lip-edges becoming modified to form a flatfish or roundish brown prominence which lies 

 usually in a median position between two rather ill defined prominences on either side of it. Receptacle 

 usually with a double curvature, its basal cell very large, somewhat inflated distally, the base and posterior 

 margin paler, cell II shorter, suffused below, strongly constricted distally, the constricted portion paler 

 or hyaline: the distal portion of the receptacle short, deeply suffused, bulging strongly anteriorly below 

 the insertion of the appendages. Insertion-cell not blackened, the appendages arising much as in L. 

 OrectochiM and L. strangulata, the branches hyaline, the basal portion closely septate] simple, without 

 persistent blackened basal portions. Spores 70 X 6 ji. Perithecia, average 130 X 60 /i. Total length 

 to tip of perithecium, average 400 fi; to insertion-cell 340 p.. Appendages 70 /i (or more V). 



On Orectogyrus glaucus Klug., Brit. Mus. No. 465, Cape Coast Castle, Africa. On elytra. 



This form is distinguished by the usually very marked inflation of its large basal cell, and the con- 

 striction of its subbasal cell, which forms a slender neck below the distal portion of the receptacle. The 



