420 



THAXTER. 



MONOGRAPH OF THE LABOULBENIACEjE. 



ally basally curved, broader at the distal end where it is rather deeply suffused with brown; cell II 

 much longer, its lower two thirds often distinctly inflated, deep brown distally, rather abruptly constricted 

 to less than half its greatest diameter, the constricted portion hyaline, the short remaining portion above 

 the constriction becoming deep brown, concolorous with the upper portion of the receptacle. Insertion- 

 cell normal, oblique, often concave above, the appendages consisting of an outer and an inner basal cell, 

 the two producing in all from three to six outgrowths, hyaline, except the first one formed from the outer 

 basal cell which is always external to those subsequently formed and is often divergent, deep brown or 

 opaque, the suffusion involving the basal cell which bears it: each branch consists of a single simple 

 cylindrical cell the distal portion of which is usually broken off, leaving the deep brown contrasting base. 

 Spores GO X 4.5 fi. Perithelium 120-140 X 40-45 fi; to insertion-cell, average 275 [i. Appendages 

 100 fi. 



On Orectochiius ?, Brit. Mus. Nos. 480 and 484, Timor, East Indies. Margin of elytra. On 0. 

 discifer Walk., Sharp Coll. No. 1079, Nilghiri, India. No. 1070 and No. 1082, " Kodeicanel " Mts., Ind. 

 Orient. 



This species possesses a strangulate habit somewhat similar to that of L. constricta; but is otherwise 

 quite different, being most nearly allied to L. eoarctata. The small protruding lip-cells vary somewhat 

 in their conformation, sometimes merely papillate, sometimes slightly spreading, subtended on the inner 

 side by a blackish suffusion which is more or less conspicuous. Fig. 20 represents one of the specimens 

 from Timor which are regarded as the type forms. 



Laboulbenia coarctata Thaxter. Plate LXVI, fig. 17. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 165. Dec, 1890. 



Perithelium short and stout, dark brown and opaque, its upper half free, its contour evenly rounded, 

 the small papillate translucent tip turned slightly inward and abruptly differentiated, the lips well defined. 

 Receptacle dirty brown finely and obscurely punctate, of the typical form, lighter below, short, stout, cell 

 I much narrowed below, cell II very broad, slightly inflated. Insertion-cell normally differentiated, 

 broad and black. Basal cells of appendages well developed bearing about eight erect short stout simple 

 branches with broad basal constricted blackened septa, their rounded tips slightly exceeding the tip of 

 the perithecium. Spores 70 X 7 fi. Perithecia 140-170 X 62 ;i. Total length to tip of perithecium 

 325-400 //; to insertion-cell 250-300 ft; greatest width 100 /i. 



On Orectochiius '!, Hope Coll. Nos. 233 and 234; Brit. Mus. No. 466, Bengal, India. Along median 

 depression of elytra. 



This species, which was found on several specimens growing along a groove of the elytra, is most 

 nearly related to L. strangulate/, but is abundantly distinct in a variety of ways. The material is in un- 

 usually good condition and abundant, and the characters appear to be very constant. Although the 

 determination of the host is doubtful, there can be little chance of confusion in the case of so well defined 

 a species. 



RHACHOMYCES Thaxter. 



This type proves to be a very constant one and the species, which are rather numerous, are found in 

 all parts of the world on Carabidse and Staphylinidse. The main axis, as has been previously pointed out, 

 is a proliferous branch arising from the subbasal cell of a two-celled appendiculate primary receptacle. 

 The variations in the development of this secondary axis are very remarkable and the most highly devel- 

 oped forms are very striking in appearance. 



In the more elongate species there are certain curious appearances on the cells of the main axis which 

 strongly suggest the stigmata of lepidopterous and other insect larvae. These appearances which are shown 

 in the accompanying figures of R. Philonthinm and R. Dolicaontis, Plate XLIV, figs. 3-4 and 8, occur 

 three on each cell as a rule, two lateral and one anterior. They do not appear to occur on the short forms, 

 and it seems possible that they may act as valves to relieve the tension caused by sudden and abrupt flexion 



