320 THAXTER. MONOGRAPH OF THE LABOULBENIACE^E. 



gin connected with the subbasal cell of the receptacle, its subbasal cell smaller, bearing usually a single 

 short antheridial branchlet; the upper cell still smaller, often hardly distinguishable, bearing one or two 

 short antheridial branchlets and a short sterile terminal branch. Antheridia terminal, one to three in a 

 series. Stalk-cell of the perithecium relatively very large, often curved, usually as large as all the other 

 parts of the plant combined, brown, slightly constricted at its insertion, nearly cylindrical, slightly and 

 gradually broader toward and below the basal cells, which are relatively small and barely separate the 

 cavity of the perithecium from that of the stalk-cell; body of the perithecium concolorous with the stalk- 

 cell, slightly inflated, tapering distallv almost symmetrically to the blunt tip, which is somewhat asym- 

 metrical from the slightly greater prominence of one of the lip-cells; the series of wall-cells strongly spiral, 

 completing as a rule somewhat more than one whole turn. Spores 30 X 3 fi. Perithecia 05 X 20 fi, the 

 stalk-cell 90-110 X 12 //.. Receptacle 25 fit. Appendage 30-40 fi. Total length to tip of perithecium, 

 average 200 ji. 



On Stilicus angularis Lee, at the base of the head on the upper side; Arlington, Mass., June. 



This species was found in the same locality and on the same hosts that yielded C. Stilici, and Slich- 

 omyces Stilicolus, and is remarkable for the great reduction of its receptacle and appendage, the hyper- 

 trophy of its perithecial stalk-cell, and the close spiral twist of its perithecial wall-cells, which is more 

 marked here than in any other species of the family. The species is most nearly allied to C. Stilici, but 

 seems constantly different in the characters above noted. 



EUCORETHROMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 433. April. 1900. 



Receptacle consisting of two superposed cells, the upper giving rise to the stalked perithecium and the 

 appendage. Appendage consisting of two superposed cells, the ^distal one bearing terminally a series of 

 branches which produce directly free, flask-shaped, sessile antheridial cells borne laterally, singly or in 

 groups. 



The type of this genus resembles Rhadinomyccs very closely in general appearance, but differs in 

 the origin and arrangement of its antheridia which are never intercalary, arising, as is indicated in fig. 6, 

 Plate LI, quite independently of one another. 



Eucokethromyces Apotomi Thaxter. Plate LI, figs. 4-G. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 433. April, 1900. 



Hyaline becoming tinged, especially the perithecium, with pale amber-brown. Receptacle short, 

 the subbasal cell usually smaller, its axis coincident with that of the stalk-cell. Perithecium rather slen- 

 der, inflated toward the base, the distal half slender tapering slightly to the blunt unmodified apex, the 

 basal cells rather small, nearly equal, the stalk-cell stout and well developed. Appendage divergent 

 almost at right angles to the axis of the receptacle, its basal cell usually more than twice as large as the 

 subbasal cell, which bears distally and anteroposteriorly a single, or partly double, row of from four to 

 six branches, some of them often elongate, slender straight or curved, suffused with dark blackish brown, 

 hyaline along the inner margin at least toward the base, obliquely septate, the septa dark; the antheridia, 

 stout, flask shaped, subtended by a dark septum, borne singly and laterally, or several together, on short 

 branchlets near the base of the branches. Spores 26 X 2 /x. Perithecia 100-125 X 25-28 /*, 35-38 X 

 14-18 fi. Receptacle 40 X 18 fi. Appendage without branches 50 X 16 fi. Total length to tip of peri- 

 thecium 190-207 /i. The Celebes material somewhat smaller. 



On elytra of Apotomus xanthotclus Bates, British Museum, No. 578, Celebes; on A. rufus Rossi, 

 British Museum, No. 577, Europe. 



Although the East Indian material of this pretty species is somewhat immature, it appears to differ 

 in no essential respect from the European specimens. The appendage represented in fig. 6 is drawn 

 from the Celebes material, while figs. 4 and 5 are from A. rufus and are taken as the type forms. The 

 host is a minute carabid beetle of singular appearance. 



