372 MONOGRAPH OF THE LABOULBENIACE^E. 



the base cellular outgrowths on one or both sides, which vary in form and size. Spores, 

 45 X 2.5-3 ft. Perithecia, 55 x 15 ft, dorsal appendages, 15-30 x 5 ft, lateral appendages longer, 

 50 x 3 ft, pedicel, 35-50 x 3.5-4 ft. Sterile appendages longer, 200-220 x 3-4 ft. General 

 receptacle, 220-900 /x ; width at distal end 90-180 ft ; the basal outgrowths, longest, 365 ft. 



On Hydrocombus lacustris Lcc. and H. jimbrialus Melsh. Near New Haven, Connecticut ; 

 York, Maine. On an undetermined Hydrocombus (?) from Slaughter, Washington (Miss Parker). 



This species presents very great variations in size and form, being elongate with a slender base 

 or short and stout; and, though usually nearly symmetrical at maturity, is sometimes very 

 considerably bent or distorted ; such differences depending doubtless largely upon the position 

 in which it grows. The basal cushion-like outgrowths, when present, are also very variable in 

 form and size, and are not infrequently once branched. In most instances their cells are 

 arranged with a certain degree of defmiteness (fig. 8), but are not infrequently irregularly 

 massed. In its younger conditions, for some time after the perithecia and appendages have 

 broken out, the plant may have a one-sided appearance until the original terminal portion 

 (primary appendage) has sloughed off; after which the cup-shaped extremity becomes usually 

 quite symmetrical. The antheridia are recognized with considerable difficulty, owing to their 

 small size, and do not appear to be very numerous ; but young perithecia with trichogynes are 

 always sufficiently abundant. 



The species was first found on hosts collected in a brook fed by a pond in West Haven, 

 Conn. ; but not in any abundance. More recently sufficient material has been obtained from 

 the brook immediately below Chase's Pond at York, Me., while several specimens were found 

 on an undetermined host, kindly collected for me in Washington by Miss Parker. It is therefore 

 doubtless widely distributed in this country, though perhaps never very common. The hosts 

 are most readily obtained in gravel just at the margins of cool brooks, or in leaves and other 

 rubbish caught on partly submerged rocks or sticks in similar situations, and the parasite, owing 

 to its large size and pale color, is very readily seen, attached to the legs and in various positions 

 on the lower surface of the thorax and abdomen. 



CERATOMYCES 1 Thaxter. Plates XXIV-XX V. 



Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 34. 



Receptacle consisting of a variable number of superposed cells bearing terminally the 

 perithecium and appendage. Perithecium consisting of four rows of wail-cells, each containing 

 numerous cells, always more than six, often several times this number (seven to sixty-five), the 

 apex various, often with a sub-terminal appendage. Appendage stout, tapering to a branched 

 extremity ; consisting of a single series of superposed cells, from the upper inner angle of which 

 may arise branches more or less copious and well developed. Asci clavate, four-spored. Spores 

 acicular, once-septate. Antherozoids long, rod-shaped, exogenous. 



The accumulation of numerous species in this genus has rendered its precise description a 

 matter of some difficulty ; since, although its characters are well marked, the different species 



1 This name occurs in Streinz, Nomenelator Fungorum, where reference is made to " Ceratomyces candidus 

 Sturm." An examination of the citation, however, shows this name to be a misprint for Crateromyces candidus. 



