102 LACTARIAE OF THE UNITED STATES 
or the surface rugose, and both of these I suspect to be common 
variations in the plant. Gillet describes three “ varieties” of 2. 
subdulcis, two of which Peck reports to have found in the United 
States, but I have collected only one of these, rufa. These two 
forms, which Gillet terms “ varieties," he describes as follows: 
Stem spongy, cap becomes more concave, of a deep live russet-chestnut, 
but unpolished, taste sweet. 
Stem full, then hollow, cap russet-cinnamon, sublustrous, taste sweet, 
then acrid, bitter. cinnamomea., 
Lactarius subserifiuus Longyear differs from the typical Z. sub- 
dulcis only in the more distant gills and the crenate margin, and 
the watery latex. It seems to me to be а depauperate form of 2. 
subdulcis, due probably to ecological conditions, all of the speci- 
mens having been collected in high, open woods. Mr. Longyeat 
states that they were growing with small forms of Г. suddulcis. 
67. LACTARIA SERIFLUA (DC.) Fr. Epicr. 345. 18438. [As Lac. 
tarius.| — Schrót. in Cohn, Krypt.-Fl. Schles. 3: 
534. 1889 
Agaricus seriffuus DC. Fl. Fr. 6: 44. 1515. 
Agaricus gynaecogalus Otto, Versuch Ара. 76- 1810. 
_ Pileus fleshy, firm, not very thick, at first plane with the mar- 
gin inrolled, then depressed with the margin elevated, brown-fawn 
307), azonate, dry, glabrous, 5-8 cm. broad, margin sometimes 
flexuous ; gills yellowish, close, decurrent 2~3 mm. broad ; stem 
of the same color as the pileus, nearly equal, dry, glabrous, solid, 
shorter than the breadth of the pileus, 4-7 mm. thick ; flesh whit- 
ish; spores whitish, subglobular, echinulate, 7-8 м; latex semi- 
transparent, resembling whey, mild (acrid, fide DC.), scanty. 
Нав. : On ground in woods, in moist and shaded places. July 
and August. 
Distris.: New York (Long Island), Peck. It has also been 
reported from Pennsylvania by Herbst. 
Плозт.: Berkl. Outl. pl. 13. f. 4; Britz. Lact, f. 37 (poor); 
Cooke, Br. Fungi, ai 1012; Krombh. Abbild. pl. до. f. 15, ТА 
18; Lucand, Champ. Fr. pl. б (good); Peck, Bull. N. y. St 
Mus. 105: pl 95. f. 7-11. | 
Exsic. : Sydow, Mycotheca Marchica блг. ; 
DISTINGUISHING FIELD-MARKS : Тһе whey-colored, semi-trans 
