294 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



growing in a more or less crowded condition, this pairing of the sexes may not be so clearly marked, 

 but it is noticeable that female spores which have begun to develop in positions where there are no male 

 individuals in close proximity tend to abort. 



The trichogynes of this genus which have been examined are of the simple type illustrated in fig. 

 23, and consist of two cells that form a thick-walled inflated structure, from the distal end of which the 

 small thin-walled receptive papilla is developed in close proximity to the end of the discharge tube of the 

 male individual, a condition almost exactly similar to that found in Enarthromyces. Abnormal males 

 rarely occur in which a second antheridium may be formed below the first, but such conditions are ex- 

 ceptional. The male individuals in the different species are all very similar and with the exception of 

 D. Floridanus, which is unusually large and possesses a very long discharge tube, can hardly be distin- 

 guished from one another. The species, which are probably more numerous than might be supposed 

 from the small number of described forms, have thus far been found only on Staphylinidse and on 

 Anthicida?, small beetles inhabiting vegetable refuse of various sorts, and sometimes swept from flowers. 



Dioicomyces Antiiici Thaxter. Plate XLII, figs. 18-25. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 33. June, 1901. 



Male individual. Form slender, of nearly the same diameter throughout, the basal cell half the total 

 length of the individual to the tip of the discharge-tube; the third cell nearly square, the subbasal about 

 as large as the terminal antheridial cell, which ends in a distal blunt projection; the discharge-tube arising 

 laterally below the tip, projecting upward from a broadened base, slightly divergent from the main axis, 

 slender, about as long, or a little longer than, the body of the antheridial cell. Length to tip of antheri- 

 dial cell, including foot, 50 fi: to tip of discharge-tube GO p. Width 8 //. 



Female individual. Often more or less strongly curved, the terminal sterile cell bluntly pointed, 

 slightly curved, brownish; the basal cell becoming narrower below, the upper septum convex; tinged 

 with brown posteriorly as is the rest of the receptacle: the subbasal cell very small, subtriangular; sepa- 

 rated from the terminal sterile cell by a somewhat smaller triangular cell. Stalk-cell of the perithecium 

 hyaline, long, often about the same diameter throughout; the thick wall becoming gradually thicker 

 distally: the perithecium slightly inflated, faintly brownish; the short, stout, broad, blunt tip slightly 

 distinguished, and nearly symmetrical; the lip-cells forming an unbroken outline, without protrusions. 

 Spores (male) 40 X 4 u, (female) 60 X 6 u. Perithecium 100-110 X 35-45 a, the stalk-cell 75-115 X 

 18 Receptacle including foot 35 X 12 a, the sterile terminal cell 18-25 X 7-9 a. Total length to tip 

 of perithecium 185-220 p. 



On Anthicus floralis Linn. Fresh Pond, Cambridge. On A. Califomicus Laf. California (Leconte 

 Collection). 



Of the three species which occur on Anthicus this is decidedly the most common and has been ob- 

 tained in abundance near Fresh Pond where the hosts were found in piles of hay or weed. It usually 

 occurs near the tips of the elytra and is subject to little variation. It is most nearly allied to D. oncho- 

 phorus, but is easily distinguished by its perithecial characters. All of the three species which inhabit 

 this host are sometimes found together on a single individual, but occupy more or less restricted regions. 



Dioicomyces onchophorus Thaxter. Plate XLII, figs. 26-29. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 34. June, 1901. 

 Male individual similar to that of D. Anthici, slightly smaller. 



Female individual. Usually strongly curved, especially at the base of the stalk-cell; similar to D. 

 Anthici; the receptacle, sterile cell, and the stalk of the perithecium, relatively smaller. Perithecium 

 dirty brown, one of the lip-cells protruding in the form of a well defined, lateral, finger-like, erect, straight, 

 or slightly curved, blunt-tipped, concolorous process; an irregular anterior elevation or angular promi- 

 nence is also more or less well defined above the middle of the perithecium. Spores (male) 35 X 4 a, 

 (female) 45 X 5 n. Perithecia to tip of projection 125-140 X 40-45 fi, the stalk-cell 90 fi. Total length 

 to tip of perithecium 210-230 n. 



