Til A XT Kit. - 



MONOGRAPH OF THE LA BOULBENIAC EL B . 



209 



The form occurring on //. piitrcscctis in Britain is taken as the type of this species as well as of (lie 

 genus. I have found not uncommonly, however, on small species of Ilomalotw infesting decaying Lactarii, 

 a smaller form (Plate XXXV, fig. 0), in which the measurements are not far from half those; of the type, and 

 which is usually distinguished by a dark suffusion at the base of the perithecial stalk-cells similar to that 

 of //. .fimilix. Large specimens of this form nevertheless occasionally occur, and correspond so closely 

 to the type that I think they should not he separated. 



Monok'omyces Brittanious Thaxter. Plate XXXV, figs. 3-4. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 413. April, 1900. 



Nearly or quite hyaline. General structure as in M. Ilomalotw, the third cell of the primary append- 

 age suffused witli blackish brown, somewhat constricted below. Fertile branches consisting of a single 

 cell bearing the antheridium and perithecium as in M. Ilomalotw. Perithecium rather long-stalked, 

 slightly asymmetrical or bent, the base inflated, tapering gradually to the blunt undifferentiated tip. 

 Antheridium borne on a pair of rather long stalk-cells, the basal cells almost exactly similar to them and 

 distally not enclosing any portion of the antheridial cavity, the wall cells well developed, the cavity within 

 them relatively small, the terminal cells growing up into generally stout finger-like processes which may 

 extend above the tip of the perithecium. Perithecium, including basal cells, 90 X 30 fi. Antheridia 

 to base of terminal projections 80 X 20 fi. 



On Homalota insecta Thorn., British Museum, No. 454, Hammersmith, England. On superior 

 surface of abdomen. 



This species is too nearly related to M. Ilomalotw, and may prove to be only a variety. It differs 

 in its more slender form and apparently also in the characters of the primary appendage: but more abun- 

 dant and better material is needed to determine to what extent these characters are constant. 



Monoicomyces Echidnogloss^e Thaxter. Plate XXXV, figs. 5-7. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 23. June, 1901. 



Subbasal cell of the receptacle somewhat smaller than the basal cell, bearing a terminal appendage 

 the basal cell of which is as long, or nearly as long as the receptacle and often distally enlarged; the axis 

 above it consisting of a curved series of several cells, externally opaque, black, hyaline along the inner 

 margin, each cell giving rise from its inner side to a hyaline simple branchlet. Fertile branches usually 

 two, sometimes one or three, arising from the subbasal cell of the receptacle, and consisting of a single 

 short basal cell which bears directly a perithecium (in some cases more than one) and an antheridium. 

 Antheridium relatively large, the stalk-cells somewhat longer and narrower than the cells of the middle 

 two upper tiers more or less prominent distally : the cells of the distal tier proliferous externally and dis- 

 tally, thus forming an outer crown of shorter appendages of very unequal length, which surround the 

 usual inner series. Perithecium becoming greatly and asymmetrically inflated below, and tapering rather 

 abruptly to the slightly distinguished, rather short, bluntly pointed tip; the stalk-cell variably developed. 

 Perithecia 100-125 X 45-55 //, the stalk-cells 40-80 X 15 p.. Antheridia 75-100 ;x, the sterile appendages 

 50-75 [i. Total length to tip of perithecium 220-250 fi. 



On the inferior surface of the thorax of Echidnoglossa Americana Fauvel. Vera Pass, Colorado. 

 Leconte Collection. 



Although closely allied to M. Ilomalotw, this species appears clearly distinguished by the prolifera- 

 tion of the last tier of cells of the antheridium, and the similar tendency of the penultimate tier, fig. 7. 



Monoicomyces similis Thaxter. Plate XXXV, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XLI, p. 305. July, 1905. 



Pale straw-colored. Receptacle consisting of two superposed cells, terminated by a straight tapering 

 simple several-celled appendage, sometimes reaching to the tips of the perithecia, and distinguished by a 

 black basal septum. The subbasal cell of the receptacle also giving rise to a pair of normally symmetrical 



