THAXTER. 



— MONOGRAPH OF THE LABOULBENIACE E. 



121 



to which such individuals must often be subject. A structure somewhat similar in appearance has been 

 described in connection with the peritheciuiQ of Laboulbenia (Monograph, Plate II, fig. I I, x). 



Rhachomyces Canariensis Thaxter. Plate XLIV, figs. 1-2. 



Proc. Am. Acad. Arts and 3d., Vol. XXXV, p. 436. April, 1900. 



Perithecium pale straw-colored, nearly straight, a median and snblerminal well-defined broadly- 

 rounded ridge marking the transverse septa between the three lower tiers of wall-cells; the tip tapering 

 rather abruptly, hyaline, the apex rounded. Receptacle rather slender, the basal and subbasal cells 

 relatively large, hyaline, the rest pale straw-colored, the main axis consisting of fifteen or sixteen cells, 

 the upper five or six forming a free erect termination. The appendages not numerous, appressed, brown ; 

 those about the base of the perithecium larger, distally blunt and hyaline, about two thirds as long as 

 the perithecium. Peritheeia 90-130 X 27-30 /i. Receptacle 175-225 /i. Appendages, longest, about 

 100 [x. Total length to tip of perithecium 250-325 



On the elytra of Trechus flavomarginatus Woll., British Museum, No. 410. Teneriffe: Paris Mu- 

 seum No. 184, on Trechus A sturiensis Le Br., Grotte de Puerto de Paganes, Asturias. Berlin Museum 

 on T. rotundipennis Duft., "Gastein." 



This small species, specimens of which from Teneriffe, fig. 1, and the single specimen from "Gastein, " 

 arc illustrated in the accompanying plate, is well distinguished by the pale color of its appendages, the 

 very prominent antheridia, and the two successive ridges which are present in the perithecium. It appears 

 to be rare, and only one or two specimens were found on each of the hosts above referred to. 



Rhachomyces Thalpii Thaxter. Plate XLV, figs. 6-7. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 436. April, 1900. 



Perithecium hyaline or straw-colored, becoming faintly tinged with brown, slender, inflated near the 

 base; the distal half or less mostly curved away from the appendages, tapering gradually to the blunt 

 undifferentiated apex. Receptacle normally consisting of eleven cells superposed to form the main axis, 

 hyaline, their septa horizontal or but slightly oblique, the basal cell subtriangular, tinged with reddish 

 brown; the cells of the secondary series hyaline and proportionately rather large. Appendages rather 

 dense, almost opaque except the nearly or quite hyaline tip and inner margin; rather short, about four 

 to six of those about the base of the perithecium much larger, longer, and stouter, reaching somewhat 

 higher than the middle of the perithecium, their tips at first clavate becoming obliquely truncate or fan- 

 shaped through the degeneration of the hyaline portion, the curved tips of the antheridia projecting rather 

 conspicuously. Peritheeia 115-30 ft. Total length of receptacle 140 p.. Longer appendages 90 p.. 



On Thalpius rvfulus Lee, U. S. National Museum, Texas. 



This species is very closely related to R. Zufii from which it seems constantly to differ in its smaller 

 size and differently shaped curved perithecium, the distal portion of which, even in young specimens, 

 is free above the longest appendages. The appendages about the base of the perithecium are in both 

 species characteristically spathulate-tipped, this type being larger, longer and more numerous in R. Zufii 

 and extending down the axis to the base. 



Rhachomyces Zuphii Thaxter. Plate XLV, figs. 10-11. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 436. April, 1900. 

 Perithecium relatively small, straw-colored, somewhat inflated at the base, the tip rather abruptly 

 distinguished and slightly inflated. Axis of the receptacle slender, consisting normally of about sixteen 

 cells which are nearly hyaline, or with brown shades below the septa. Appendages nearly opaque, straight 

 stout appressed, not elongate, more or less swollen distally along the inner margin of the subhyaline tip; 

 eight to ten about the base of the perithecium longer and stouter. Peritheeia 110-140 X 25 ft. Longer 

 appendages about 110-140 p. Total length to tip of perithecium 350-400 ft. 



On Zuphium Mexieanum Chaud., British Museum (Biologia Coll.), No. 713. Cordova, Mexico. 



