THA.XTER. MONOCIiAI'll OF TIIIO LA BOl' LBK.\ I ACK/K. 



297 



Smeringomyces anomalus nov. comb. Plate KLII, figs. 11-42. 

 RhachomyvcH anomalus Thaxtcr. I'roc. Am. Acad. Arts and Sci., Vol. X.WVIII, p. 25. Juno, 1002. 



Male (?) individual bristle-like, composed of about four superposed cells, nearly opaque, slender, 

 tapering Id the hardly differentiated small pointed foot. 



Female (?) individual. Receptacle relatively small, consisting primarily of four superposed cells, 

 tapering slightly to the relatively large pointed foot. The basal cell relatively large, the third bearing 

 distally and posteriorly one or two stout bristle-like, simple, rigid, black-brown, hyaline-tipped append- 

 ages; the fourth cell becoming divided to several smaller cells from which arise, a usually less suffused 

 primary external appendage, the perithecium, and one or two secondary bristle-like appendages: the 

 appendages about five in all, relatively large, appresscd, together more or less completely surrounding the 

 base of the perithecium and extending nearly to its tip. Perithecium tinged with purplish brown, or nearly 

 hyaline, the body relatively long, very slightly inflated, broader distally, tapering slightly to the blunt tip, 

 from which the apex forms a long pointed, hyaline, lateral or subterminal projection toward a large curved, 

 horn-like, stout, hyaline outgrowth of the perithecium, which, arising externally just below the: tip, extends 

 upward beyond the apex over which it is slightly recurved (or more rarely curved away from the tip), 

 ending in a bluntly pointed extremity. Spores 46 X 4 fi. Perithecia 75-90 X 20-25 fi, the outgrowth 

 35-45 X 14 /*. The longer appendages 75 p. Receptacles 35-45 p. Total length to tip of perithecium 

 110-125 /(. 



On Conosouia pubescens Payk., Waverley, Mass. 



This species grows appressed on the scattered bristles which cover the body of its host and appears 

 to be rather rare. Though minute, its form is strikingly peculiar owing to the beak-like apex and horn- 

 like appendage of its perithecium. It is often associated on the same individual with the more common 

 Sficliomyces Conosoviw. The host is a small and very active Staphylinid which is found commonly in 

 rotten wood. 



ACOMPSOMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 37. June, 1901. 



Receptacle two-celled, bearing an antheridial branch terminally and a single perithecium laterally. 

 Antheridial appendage consisting of a stalk-cell wholly united to the receptacle, or nearly so, and three 

 superposed cells which form the appendage proper: the terminal cell bearing distally a single spinose an- 

 theridium, the subterminal cell sterile and the lowest cell bearing distally two or three antheridia. Peri- 

 thecium furnished with a stalk-cell, five and six wall-cells being present in the rows. Triehogvne 

 producing clavate branches which bear distally several nearly spherical receptive papillae. 



Although the type of this genus is a very simple one, and the species differ within very narrow limits, 

 it is extremely well marked, and essentially constant. The appendage, except for the sterile subtermi- 

 nal cell, is very like a simple form of Stigmatomyces, though the antheridia with their characteristic 

 outcurved necks are not all produced on the same side of the appendage as in this genus, with which, 

 however, it seems closely allied. The appearances seen in the original type (A. Corticarice) of which but 

 a single specimen was obtained, gave the impression that in this genus, as in D imorphornyces or Dimer- 

 omyces, the basal cells of the perithecium became disorganized, so that the cavity of the stalk-cell and 

 perithecium were confluent. Sufficient material, however, of other forms, shows that this is not the case, 

 the basal cells being clearly defined at maturity. The species all appear to be rare, at least an examina- 

 tion of great numbers of hosts has yielded very few infested specimens, and in only two instances have 

 young individuals been found. Three specimens, however, bear triehogynes (figs. 8 and 12, Plate XLII) 

 that are unique from the peculiar differentiation of the receptive parts which appear as terminal spheri- 

 cal vesicles, as shown in the figures. The hosts are the smallest, with the exception of Trichopteryx, on 

 which Laboulbenia; have been found, and are common in piles of weed or grass etc. 



