MICHIGAN ACADEMY OF SCIENCE. 75 



at len^tK stained lurid-brownish or rusty, close, moderately narrow, adnate, 

 forked or anastomosing at base. Stem white, obscurely rivulose, hard 

 and compact, subequal, solid, 3.5-4.5 cm. long, 1.5 cm. thick, often discolored 

 by yellowish-rusty stains. Spores white in mass, subglobose, minutely 

 echinulate, 7-8 micr. Taste mild. Odor none. 



Only a few doulDtful collections have been made in southern Michigan. 

 The above description is taken from my notes of the Swedish plant as known 

 to Romell, and agrees mostly with that of Bresadola. Most modern mycolo- 

 gists consider the Friesian "rugulose-reticulate" character of the stem as 

 too uncertain to be practicable. The important characters are: The hard 

 consistancy, the wrinkled, rarely "cutefracta" surface of the cap, the cuticle 

 not reaching to margin of the cap, and the gills discolored in spots. The 

 cuticle apparently discontinues to grow so that the surface of the expanding 

 pileus ma}* become somewhat areolate cracked and the margin naked. 



The species does not seem to be known with definiteness to American 

 authors, and Peltereau says of the European situation that "here is a plant 

 which has been the cause of very different interpretations, and one could 

 write a volume on its vicissitudes." I believe it best to follow the interpre- 

 tation of Romell who is supported bj^ Prof, von Post, formerly a pupil of 

 Fries and his collaborator as artist of many of the Friesian figures now located 

 in the Museum in Stockholm. 



RUSSULA LILACEA Quel. 



The plants referred here were in all respects like specimens found nea 

 Stockholm, and referred by Romell to R. lilacea. The description follows ^ 



PiLEUS firm, convex then subexpanded to subumbilicate, 4-8 cm. broad', 

 dull or dark lilac-flesh color, darker on disk, radiately rugulose, margin 

 even, pellicle adnate or but slightly separable extending to margin, viscid 

 when young or moist; flesh white. Gills adnate, sometimes slightly de- 

 current, white or whitish, some shorter, occasionally forked, narrow, close, 

 plane. Stem white or reddish, rigid, solid becoming spongy, slightly 

 rugulose, equal, 4-5 cm. long, 8-10 mm. thick. Spores whitish. Taste ?/rt7-i. 



Mixed woods in northern Michigan, oak etc. in the south. Aug. Quelet 

 describes the gills as "distant, adnexed, ventricose, and subserrate". Our 

 plant has close, narrow, nonventricose gills and in this respect is nearer 

 R. vesca than R. lilacea Quel., which Massee has made a variety of it. 

 Furthermore Quelet says R. lilacea has a fragile pileus, while in our plants 

 it is firm. 



24. RussuLA AERUGiNEA Lindb. 



(The verdigris-green Russula.) 



Pileus 5-8 cm. broad, medium firm or sub-fragile, convex to expanded, some- 

 what depressed on disk, dull green or dark green, sometimes with an umber 

 tinge, with a thin, slightly separable, subviscid pellicle when moist, subshining 

 or dull and sul^pulverulent or pruinose-velvety when dry, slightly striate on 

 margin. Flesh white, sometimes ashy under cuticle, thick on disk, thin at 

 margin. Gills white, then pale cream color, becoming dingy with age, sub- 

 distant to close, firm and distinct, broader in front, narrowed behind, almost 

 free, few shorter, somewhat forked at stem, intersjjaces venose. Stem 4-5 cm- 

 long, 1 cm. thick, white, subequal or tapering downward, glabrous, spongy, 

 stuffed, even, firm. Spores creamy-white, or whitish, globose, 6-7 micr. 

 Taste mild. Odor none. 



