304 



MONOGRAPH OF THE LABOULBENIACE^E. 



its stalk-cell hyaline, blackened at its base, two or three times as long as broad, its basal cells 

 not abruptly distinguished, and concolorous with it ; the inner as long as the stalk-cell. Recep- 

 tacle short, narrowed below, the basal cell small, hyaline or brown and translucent, the rest 

 black, opaque. Terminal appendages short, usually broken or obsolete, the main (lateral) 

 appendages primarily two in number : an upper simple, a lower furcate near its base, each con- 

 sisting of a main more or less obliquely septate axis, from which numerous obliquely septate 

 more or less appressed branches are produced externally, which may themselves produce simple 

 branchlets ; the branches externally opaque. Spores, 40 x 4 /x. Perithecia, including basal cells, 

 415 x 50-130 x 33 /x. Average, 290 /x long ; the stalk-cell, 37-95 fx long. Appendages, 130- 

 536 fi long. Total length to tip of perithecium, 600-200 /x. 



On Cryptobium pallipes Grav., and C. bicolor Grav., Virginia, Pennsylvania, Kansas. ► 



The type of this fine species was found on the leg of a specimen of C. pallipes sent me 

 from Virginia by Mr. Pergande, and a small number of examples was subsequently found on a 

 specimen of C. bicolor in the Museum collection. More recently a large number of both these 

 hosts, sent me from Kansas by Mr. M. A. Barber, have yielded abundant material, and it is much 

 to be regretted that the figures given on Plate IX. should not have been drawn from these per- 

 fect and well developed specimens. The species varies very greatly in size, as may be inferred 

 from the above measurements, as well as in the relative length of its different parts. In perfectly 

 developed specimens the appendages often slightly exceed the tip of the perithecium. There is 

 a good deal of variation in the number and length of the branchlets, more than one commonly 

 arising from each cell of the main axis, which, though straight and rigid, appear to be formed 

 as a result of successive sympodial branching. Specimens occurring on the abdomen of the host 

 are commonly far larger than those which are attached to the legs. In general appearance the 

 species recalls in some respects the remarkable East Indian Laboulbenia palmella (Plate XV11I, 

 fig. 11), but the resemblance is wholly superficial. The hosts above mentioned are large and 

 conspicuous Staphylinid beetles, common under stones and in wet rubbish along the margins 

 of streams and ponds. 



Corethromyces jacobinus Thaxter. Plate IX, figs. 3-5. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 181. 



Perithecium hyaline, becoming faintly brownish, rather short, somewhat inflated, tapering to 

 a blunt apex. Receptacle short, the basal cell small, hyaline ; partly, sometimes wholly, black 

 and opaque. Appendages arising in a fan-like tuft, the two or three main axes usually short, 

 formed by sympodial branching ; the branchlets once or twice branched, much longer, the outer 

 becoming brown, the inner mostly hyaline. Perithecia, 65-75 x 22 fx. Appendages about 160- 

 200 /x long. Total length to tip of perithecium about 150 /x. 



On Lathrobium jacobinum Lee, California ; on L. collare Er., Kittery Point, Maine ; on 

 Lathrobium sp., Arlington, Mass. 



This small species varies very greatly in luxuriance ; figures 3 and 4 representing more or 

 less extreme cases, between which every degree of development may be seen. In a few instances 

 two perithecia are formed, one above the other, as already described. The form, though so 



