444 



THAXTER. MONOGRAPH OF THE LABOULBENIACEJ3. 



ZODIOMYCES VORTICELLARIUS Thaxter. 



This species has been again found on Hydrophilidae from Lake Eustis and Coeoanut Grove, Florida, 

 and enormous individuals, some of them three millimeters in length, were obtained in the Paris Museum, 

 No. 121, on a large species of Hydrophilus from Rosario, Argentina. Despite the size of the receptacles 

 in these individuals, the perithecia and other structures seem identical with the smaller forms, and certainly 

 cannot be separated specifically. 



EUZODIOMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 449. April, 1900. 



Receptacle elongate, multicellular, terminated by a primary branched appendage, and consisting 

 of a large and indefinite number of superposed cells which distally become divided longitudinally to form 

 successive tiers of cells which become proliferous on one side and give rise to a unilateral series of perithecia 

 and sterile (and antheridial ?) appendages. Perithecia having nine or ten wall-cells in each row and borne 

 on two superposed cells which form a stalk. 



The material illustrating this very peculiar genus is for the most part in very poor condition, and 

 includes but one mature individual. The appendages and young perithecia are so matted together that 

 I have found it impossible to determine accurately the character of the antheridial branchlets. In a 

 few cases flask-shaped cells have been observed which are borne one to three together on short branches. 

 Whether these are really antheridia, however, can only be determined by the examination of fresh material. 



The genus is most nearly allied to Zodiomyces and to Kainomyces, the short stout blunt and very 

 peculiar perithecium suggesting that of Kainomyces, while its two-celled stalk is similar to that of Zodi- 

 omyces. The receptacle ends in a primary appendage which bears a number of filamentous branches, 

 and below its base the perithecigerous area extends downward on one side for a variable distance. Whether 

 this perithecigerous region originates endogenously, as in Zodiomyces, I have been unable to determine 

 from the material available; but such does not appear to be the case. The elements arising from this 

 region, however, consist of sterile rarely branched filamentous appendages which form a double row en- 

 closing the other structures within, somewhat in the same manner that the circular series in Zodiomyces 

 encloses the region from which the perithecia and antheridial appendages arise. The strobil-like perithe- 

 cium is quite unique and no lip-cells appear to be differentiated. In some specimens the receptacle is 

 very slender while in others it may be stout and densely cellular. 



The species does not appear to occur in America, but seems to be not uncommon in England where 

 it is to be hoped that fresh material may be obtained, and more thoroughly investigated. 



Euzodiomyces Lathrobii Thaxter. Plate LXXI, fig. 23. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 449. April, 1900. 



Hyaline or faintly yellowish. Receptacle long and slender, or shorter and stouter, according as the 

 longitudinal septa are few or abundant; the superposed cells and those composing the tiers sometimes 

 nearly a hundred in number, the upper half or more producing a unilateral series of perithecia and append- 

 ages. Perithecia distinctly broader distally, the fourth or the fifth to the seventh wall-cells inclusive, of 

 each row, growing upward and outward to form well developed prominences, giving the margin on either 

 side in this region a bluntly serrate appearance; the lip-cells arched, forming a characteristic broad dome- 

 like apex; the lower stalk-cell small, the upper much larger, stout somewhat inflated and nearly as broad 

 as the base of the perithecium. Appendages long slender cylindrical, simple or sparingly branched, flexu- 

 ous. Perithecia 75 X 28-30 p. (including projections), stalk about 40 \i, the upper cell about 22 X 14 a. 

 Total length of receptacle 200-475 X 25-70 p. Appendages 125-230 X 4 p.. 



On Lathrobium punctatum Zett., British Museum No. 442, Notting Hill, England; on L. mulfi- 

 punctatum Grev., British Museum No. 429, Europe; on L. filiforme Grav. British Museum No. 443, 

 Notting Hill, England; on L. brunneipes Fab., Thornhill, England. Sharp Collection, No. 1144. 



