300 



THAXTER. — MONOGRAPH OF THE LABOULBENIACEJE. 



in the accompanying figures; since it seems probable that in the specimens examined the whole mass 

 has been displaced from a position lower down, nearer the base of the funnel-shaped cavity below. As 

 far as can be determined by an actual count, there appear to be not less than thirty-two such ascogenic 

 cells in a single perithecium, and perhaps more in some individuals. 



Further knowledge of this very peculiar type is much to be desired, and it is to be hoped that English 

 observers may be able to obtain material of young individuals which will make it possible to determine 

 the nature of the antheridium. The host of the unique species is a staphylinid allied to Tachinus and 

 appears to be rare in collections, although it is well represented in that of Dr. Sharp, in which, however, 

 much to my regret, I was unable to discover any individuals that were infested. 



Polyascomyces Trichopiiy.e Thaxter. Plate XXXVII, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 415. April, 1900. 



Pale dirty brownish. Perithecium broadest in the ascigerous zone, tapering thence to the distinctly 

 differentiated neck-like tip, the subterminal wall-cells enlarged distally, externally and laterally, the re- 

 sultant rounded protuberances forming a ridge about the tip just above its middle, the distal portion, 

 formed by the lip-cells, of which that on the right is slightly longer than the rest, broad blunt brownish, 

 the other three somewhat shorter terminating in narrow blunt extremities which lie on three sides of the 

 first. The stalk-cell similar to and lying beside the subbasal cell of the receptacle to which it is united 

 throughout, its base being in contact with the distal end of the basal cell, while from its distal end the 

 large basal cells of the receptacle curve abruptly outward and upward. The appendage consisting of 

 from three to six flat superposed darker brown cells, constricted at the septa, looking as if they had been 

 made irregular by crushing, the terminal portion (antheridium?) blunt, slightly longer than broad, with 

 evidences of lateral apertures. Spores 28 X 2.5 ji. Perithecia 175 X 50-65 fi. Basal cells 40-48 X 

 30 /(. Stalk 38 fi. Receptacle 70 p.. Appendage 4S-60 X 20-24 p. 



On the superior surface of the abdomen of Trichophya pilicornis Gyll., British Museum, No. 453, 

 Famham, England. 



ACALLOMYCES Thaxter. 

 Proc. Am Acad. Arts and Sci., Vol. XXXVIII, p. 23. June, 1902. 



Receptacle consisting of two superposed cells, the lower sometimes obsolete or indistinguishable 

 from the foot, the upper bearing a single perithecium and an antheridial appendage. Appendage clearly 

 differentiated, simple and without branchlets, consisting of an adnate stalk-cell and five cells super- 

 posed above it, the two terminal ones each bearing a single antheridium, the terminal antheridium spinose, 

 the subterminal one adnate to the terminal cell of the appendage. 



A very simple generic type closely allied to Acompsomyces and also resembling Stigmatomyces in the 

 characters of its appendage. The latter appears to be similarly distinguished by the presence of a stalk- 

 cell, a basal cell and several (four) cells superposed above it. The two antheridia are superposed and 

 appear to have been separated from the terminal and subterminal cells. Although it is difficult to point 

 out crucial differences which separate this appendage clearly from that of Stigmatoviyces, unless it be 

 the sterility of the four lower cells, there can be no question of the distinctness of the generic type, which 

 is in reality nearer that of Acompsomyces. In this, however, the subterminal cell of the appendage is 

 sterile and the cell below this bears more than a single antheridium. The type bears a very strong re- 

 semblance to Polyascomyces; but, since nothing is known as to the true character and disposition of the 

 antheridial cells in this genus, the relationship remains problematical. 



Acallomyces Homalot^e Thaxter. Plate XLII, figs. 1-4. 



Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 24. June, 1902. 

 Hyaline becoming faintly tinged with straw-yellow. Receptacle very small the lower half becoming 

 tinged with smoky brown; the basal cell hardly distinguished from the foot, and commonly obliterated 

 by a thickening of the walls in this region, so that the receptacle appears to be one-celled. Basal cell of 



