NEW SPECIES OF RUSSULA FROM 

 MASSACHUSETTS 



Gertrude S. Burlingham 



In October, 1916, Mr. Simon Davis sent me for examination 

 and identification an interesting collection of Russula made in the 

 vicinity of Stow and South Acton, Massachusetts. Twenty 

 species were represented, including R. fallax Fr., R. fragiliformis 

 Burl. (R. fragilis Fr.), R. glauca Burl., R. heterophylla Fr., R. 

 insignis Burl., R. Integra (L.) Fr., R pectinatoides Pk., and R. 

 veternosa Fr. Eight other species I have reserved for further 

 study, either awaiting notes regarding some particular point 

 should the same species appear another season, or comparison 

 with European material. Four species, however, differ so much 

 from any related European or American Russula that they seem 

 entitled to rank as new species. All of these were accompanied 

 with careful and complete field notes and spore prints, and the 

 dried plants were in excellent condition and in sufficient quantity 

 to give a good idea as to the possible variations. 



Russula Davisii sp. nov. 



Pileus broadly convex, depressed in the center, becoming ex- 

 panded with the margin drooping, up to 18 cm. broad; surface 

 entirely Pinard-yellow, or tinged with dull-reddish on the margin, 

 viscid when wet, with separable pellicle, pruinose when young, 

 then glabrous ; margin even, at least the striations not pronounced ; 

 context white, firm but brittle, mild without special odor; lamellae 

 buff-yellow when developed, equal, forking near the stipe, venose- 

 connected, pilose, narrowed at the inner end, adnexed to slightly 

 decurrent, broad at the outer end, up to 13 mm. broad, subdistant; 

 stipe more or less washed with bluish-pink, very slightly dis- 

 coloring grayish or sordid, expanding at the apex, tapering down- 

 ward, rather firm, spongy, becoming hollow, glabrous, up to 7 cm. 

 long and from 2 to 3 cm. in diameter ; spores ochraceous, ellipsoid, 

 coarsely and abundantly echinulate, 10-12 X 8.5-10 /x ; cystidia 

 50 fi or more long by 18 fx wide. 



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