4:5 1 
THAXTER. 
MONOGRAPH OF THE LABOULBENIACE.E 
Sufficient material of this species was obtained from alcoholic specimens of its host, and is in very 
mod condition. The cells of the receptacle often appear to be longitudinally divided as in fig. 1; but the 
mailer apparent cell is merely a space between the general envelope and the cell-wall proper. The spe- 
ll s ifl most nearly related to R. ekphantinus, from which it is distinguished by its smaller size, more 
Bknd i habit, shorter appendages, amber-brown color, and by the more numerous and differently formed 
looth-like outgrowths from the perithecial neck. 
AUTOICOMYCES nov. gen. 
Ceratomyces Thaxter pro parte. 
Receptacle consisting of three superposed cells, the lowest often involved by the blackened foot, the 
upper surmounted by a pair of cells giving rise to the single perithecium and the antheridial appendage 
respectively. Antheridial appendage consisting of a series of superposed cells producing ramigerous 
branches irregularly along its inner margin. Perithecium usually appendiculate, determinate, the wall- 
cells in rows of seven and eight members. 
rt-\ 
This genus which I have already pointed out, is very nearly related to Ceratomyces emend., differs 
in the constant and comparatively small number of cells forming the rows of wall-cells in the perithecium; 
the inner and outer rows having eight and the lateral rows seven in all species examined. All the known 
forms inhabit species of a single genus, Bcrosus, a fact which has suggested the generic name, and of the 
six that have* been described, one occurs in the East Indies, while the rest are American. In addition 
to the three forms illustrated herewith, three others, Aatoicomyces furcatus, A. distortus and A. humilis 
were formerly included in Ceratomyces and it may be mentioned that a seventh species is known to occur 
on Bcrosus in South America. All the species have a certain family resemblance and are for the most 
part pale, or quite hyaline. A. humilis, of which good material has been again obtained from the type 
locality, is the only form which lacks a perithecial appendage, the conformation of its tip being rather 
exceptional! the edges spreading somewhat and pointed, not compressed as in the other species. 
contortus has also been found on the same host in the vicinity of Fresh Pond, Cambridge, but the other 
New England species have only been met with in the small pond, formerly referred to, on the highest 
point of Cutf s Island, at Kittery Point, Maine. 
2 
i. 
acuminata s 
Plate LXVIII, fig. 8. 
— _-j^^„ uuuuuu( . vuo uuv, WUJU. J. liUC IjAVIII, ilg. o. 
Cerato>, cea acuminata Thaxter. Proc. Am. Acad. Arts and Set., Vol. XXXV, p. 447. April, 1900. 
Hyaline. Receptacle consisting of three superposed cells, the basal cell partly suffused and con- 
tinuous with the blackened foot. Perithecium rather stout, the outer margin nearly straight, the inner 
trough convex; the seventh wall-cell of the inner row greatly enlarged, its outer wall very thick, forming 
■m erect tapering bluntly pointed terminal appendage, at the base of which the papillate apex of the lip- 
alb projects on the right side; the fifth cell of the external row of wall-cells growing out to form a sub- 
ternnnal slender ainx'Tidiurf. *>;rrl,t-,.,.ii~,4 :„ +u„ 4. *•_.» n ,, . , .. . . , „i 
terminal slender appendage, eight-celled in the type, distally attenuated, its terminal cell bearing one or 
two slender branches. Appendages consisting of from four to five superposed cells, the distal ones ap- 
pendHiilat, (the branches mostly broken). Perithecium 185 X 40 a. The appendage without branches 
82 n, the branches 150 ft; the rostrate terminal cell 50 X 17 ft (i ' ' s " " ' "" " MO c 
about 70 X 3.5 fi. Appendage, broken, without branches 70 ft. 
Spore 
O 
A 
conformat 
specimens 
of thi 
ie 
genus 
rked form were found in Lake Eustis on a Beromts very like B. strwtus. 
character of its perithecial appendage distinguish it from other species 
