THAXTER. — 



MONOGRAPH OF THE LA HO U L R E N I A ( ' E/E . 



275 



apex blunt, the stalk-cell usually rather short and stout. Perithecia 75 X 25 //., the stalk-cell 20 X IS //.. 

 Sterile appendages, longest 150 /«. Appendages of antheridium 100 /«. Total length to tip of perithecium 

 150 /<. 



On Oxytelus sp. Berkeley, California. 



The antheridia are so placed in the specimens of this species which have been examined, that it has 

 been impossible to determine the details of their structure, which are further obscured by the irregularities 

 and relatively considerable development of the appcndiculate cells. The species is distinguished from 

 the others by its dark sterile appendages, as well as by other points of difference. 



EUMONOICOMYCES iNVisimi.is Thaxter. Plate XXXVII, figs. 7-8. 

 Proc. Am. Aeacl. Arts and Sci., Vol. XXXVII, p. 21. June, 1901. Monoicomyccs invisibilis Thaxter, 1. c. 



Vol. XXXV, p. 414. Apr., 1900. 

 Hyaline. Basal cell of receptacle small subtriangular, the subbasal cell rather long and narrow, 

 bearing terminally a distally rounded cell from which it is separated by an oblique septum and which is 

 surmounted by a short simple cylindrical appendage; the fertile branch developed on one side only, not 

 distinguished from the receptacle and its appendage, consisting of two or three obliquely superposed cells 

 extending obliquely upward in a divergent series, the terminal cell bearing a perithecium and antheri- 

 dium in the usual relative positions, the subterminal cell sometimes apparently producing a second an- 

 theridium instead of the simple paired appendage which terminates the lower cell of the series. Perithe- 

 cium borne on a rather short stout stalk-cell, its inflated basal half not distinguished from the flattened 

 basal cells, its slender distal half abruptly distinguished. Antheridium apparently similar in general to 

 that of the other species. Perithecia 84 X 30 /i. The stalk-cell 20 X 10 /i. Receptacle, sterile part, 

 about 40 /(. Total length to tip of perithecium 110-140 fi. 



On Homalota putrescens Woll., British Museum, No. 412, Azores. 



This species is so minute and so inconspicuous from its pale color, that it would almost inevitably be 

 overlooked on dried hosts. One or two additional specimens were accidentally obtained in the Sharp Col- 

 lection from scrapings of various species of Homalola. In none of the individuals, however, can the 

 detailed structure of the antheridia be made out. 



HAPLOMYCES Thaxter. 



The genus Bledius, on which all the species of Haplomyccs have thus far been found, is not well 

 represented in the various collections examined, and no additional species have been discovered. 



Haplomyccs Texanus Thaxter, or a form indistinguishable from the type of this species in which 

 the base of the appendage is black, has been found on the following hosts: Bledius bicornis Germ., Hope 

 Collection, No. 213; no locality: B. subterrancus Erichs., Hope Collection, No. 220, Prussia: B. opacus 

 Blk., British Museum, No. 448, Isle of Wight: B. bicornis Germ., British Museum, No. 432, "Europe": 

 B. juvencus Erichs., Berlin Museum No. 841. A broken specimen on B. obtusus (Sharp Collection No. 

 1176) may perhaps also belong to this species. Whether this apparent form of Texanus should be con- 

 sidered identical with the short stout dark H. Californicus, and whether H. Texanus itself is more than 

 a variety, I am unable definitely to decide without examining more abundant material. The types of 

 H. Californicus arc, however, numerous and in good condition and show no variation from the characters 

 represented in my Monograph, Plate VII, figs. 1 and 2. 



EUCANTHAROMYCES Thaxter. 



Nine species have been added to this genus since the publication of the type-species E. Alrani, which 

 probably illustrate the possible variations of its members more or less fully. The type of structure is a 

 very constant and simple one; and, apart from certain differences in the cell relations, the modifications 

 of the perithecial wall-cells and the conformation of the perithecial tip, the characters which appear to 



