430 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^E. 



On the elytra of TricJiopteryx Haldemani Lec., Intervale, N. H. On species of Triclwpteryx, near 

 Fresh Pond, Cambridge, and at Kittery Point, Maine. 



This species seems to be commonly distributed on various species of its curious and microscopic 

 host, which is the smallest insect thus far known to be infested by Laboulbeniales. It varies very consid- 

 erably in the amount of secondary growth of its receptacle, the extremes in this respect being illustrated 

 by figs. 15-17. The host is often very abundant in piles of moist vegetable refuse. 



MISGOMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 443. April, 1900. 



Receptacle indeterminate, consisting of numerous cells superposed singly, or in tiers of two or three 

 cells each, ending distally in an appendicular^' portion not clearly distinguished from the receptacle, and 

 a solitary perithecium, the two related to one another somewhat as the corresponding structures are re- 

 lated in Laboulbenia. (Antheridia simple and borne free on the short appendages ?). 



In the absence of any exact knowledge as to the antheridia, it is not possible to define this type very 

 precisely, although its general characters are such as to distinguish it very clearly from other genera un- 

 less perhaps from Edeinomyees, which also possesses an indeterminate multicellular receptacle. The 

 antheridia seem to be evanescent, and in even the youngest specimens, in which the perithecium is quite 

 undeveloped, what appear to be the remains of them, only, have been seen. The appendages are not 

 well developed and are irregular in their origin; the primary "appendage" from which they arise recalling 

 that of Ceratomyces, although less definitely differentiated and varying considerably. It seems safe to 

 assume from an examination of the material available that the antheridia are simple and free, but it is 

 to be hoped that European observers may obtain fresh material of the young conditions of M. Dyschirii, 

 which appears to be common on various species of Dyschirius, in order definitely to determine this point. 

 Until the antheridia are known, it is difficult to judge of the nearest relationships of the genus, but the 

 character of its receptacle would appear to ally it to Edeinomyees, although the primary appendage is 

 clearly distinguished in this genus and the perithecium is different in character. 



Misgomyces Dyschirii Thaxter. Plate LXX, figs. 9-10. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 443. April, 1900. 



Rather rich amber-brown, the receptacle consisting of from eight to twenty-three superposed cells, 

 the upper ones rarely divided longitudinally, the distal cell lying between several, usually three, smaller 

 cells which become separated from it on either side, and which, together with its base, are united to the 

 base of the perithecium; while above it, and separated from it by a thin dark insertion, a cellular base 

 gives rise to the group of appendages, the irregular basal cells of which alone remain in the material ex- 

 amined. Perithecium nearly oval or very slightly pointed, the tip and lips undifferentiated. Spores, 

 seen only in perithecium, with base apparently abruptly recurved or bent, about 60 X 3.8 [i. Perithelia 

 70-85 X 35-40 Receptacle 135-400 fi. Total length to tip of perithecium 200-435 fi. 



On Dyschirius globosus Herbst., Hope Coll., No. 349, England; on D. salinus Schaum., British 

 Museum, No. 582, Europe. On D. politus Dej., D. externus Sch., D. digitatus Dej., D. nigricollis F., 

 D. loeviusculus Putz., Europe, Berlin Museum Nos. 894, 895, 896, 897. 



This species is very clearly distinguished from the next by its amber-brown color, more simple re- 

 ceptacle and differently shaped perithecium. It does not appear to be rare on species of Dyschirius in 

 England and on the continent, but has always been found with the appendages badly broken, so that no 

 antheridia are visible, and even the appendages themselves can with difficulty be made out. The host 

 is a minute carabid allied to Clivina. 



