306 



MONOGRAPH OF THE LABOULBENIACE.E. 



the base of the primary sterile branch (fig. 22) in R. cristatus; but its significance is 

 undetermined. 



As has been previously mentioned, it may eventually prove necessary to unite this genus with 

 Corethromyces. 



Riiadinomyces pallidus. Plate IX, figs. 7-9. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 180. 



Hyaline or slightly yellowish. Perithecium becoming pale amber brown, except the tip, 

 which is colorless ; more or less inflated, conical above, the apex blunt symmetrical, the stalk- 

 cell about as long as the receptacle. Receptacle small, the basal cell somewhat larger than the 

 sub-basal. Appendage of three nearly equal cells, the distal bearing terminally from one to 

 three sterile, simple, tapering flexuous branches ; the other two producing distally groups of 

 antheridial branchlets arising from small cells cut off from their upper inner angles. Spores, 

 45 x 3.7 fM. Perithecia, 86 x 33 /x. Primary appendage about 60 its longer branches 225- 

 375 /x. Total length to tip of perithecium, average 200 /i. 



On Lathrobium punctulatum Lee, and L. angulare Lee, vicinity of Cambridge, Mass., and 

 Kittery Point, Maine. 



Var. a. Plate IX, fig. 10-11. Larger than the type, the perithecia proportionately narrower, 

 becoming evenly suffused with amber yellow. Appendage often relatively shorter with numer- 

 ous sterile branches arising from all its cells, often crowded, and usually producing short 

 antheridial branchlets. Perithecia, larger, 165 X 45 p. Spores, 44 x 4 p. Appendage, 37- 

 150 fj, ; its longest branches about 300 Total length to tip of perithecium (larger), 425 /j.. 



Occurring with the type on L. punctulatum Lee; on L. fulvipenne Grav., Germany. 



As a matter of convenience I have separated from the type, which is on the whole moder- 

 ately constant, a series of larger forms often occurring with it and approaching L. cristatus in 

 some respects. While in the type the size is small, the perithecia pale amber brown with hyaline 

 tips at maturity, the branches of the appendage few in number, with the antheridia borne in 

 the typical fashion directly from the main appendage ; 'in the variety very considerable differ- 

 ences in size and general habit are noticeable. While in the type two perithecia are unusual, in 

 the variety there are sometimes five, uniformly tinged with amber yellow ; the appendage is apt 

 to be much more copiously branched, and though this is not always the case, it is often decidedly 

 shortened, with a corresponding increase in the luxuriance of its branches. In the European 

 specimens the appendage is more normal in form and much like that of R. cristatus, which in the 

 end may prove a mere variety. It is also distinctly larger even than the ordinary American 

 forms of the variety, but cannot be separated specifically. 



Riiadinomyces cristatus Thaxter. Plate IX, figs. 12-15, 22-23. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIH, p. 180. 



Perithecia one to four, hyaline, becoming yellowish or pale brownish, the stalk-cell as long as 

 or considerably longer than the perithecium proper. Appendage large, the terminal cell bearing 

 distally a series of from two to six (usually four) long, stiff, cylindrical, septate, dark red brown 



