North American species of Lactarius / L. R. Hesler, Alexander H. Smith.

Subgenus Plinthogalus

111

the distant gills and lack of color changes distinguish it. The color of
the spore deposit is not known, but on the basis of the height of the
spore ornamentation, one would expect it to be yellowish.
Material cited.-PENNSYLVANIA: Peck, type (NYS), legit
D. R. Sumstine; TENNESSEE: Hesler 3746, 29980.
17. Lactarius gerardii Peck
Bull. Buffalo Soc. Nat. Sci. 1: 57, 1873
var. gerardii
Illus. Pls. 19-20; figs. 37-38, 180.
Pileus (3)5-10(13) cm broad, convex with a small umbo, expanding to plane or finally depressed and with or without the umbo, dark
dull yellowish brown ("Dresden-brown" to "snuff-brown" or "Saccardo's umber"), or at times fading out to golden brown, dry, azonate,
velvety, radiately rugulose and with scattered acuminate brown hairs,
margin even but often becoming crenate or wavy. Context firm, thin,
white and unchanging from contact with the air but yellow in 15 percent KOH; odor not distinctive; taste mild (see Peck, l.c.) becoming
slightly acrid. Latex white, unchanging and not staining the flesh.
Lamellae adnate becoming decurrent, white, finally pale cream
color, not becoming spotted, subdistant when young, soon distant (very
distant at maturity), intervenose, thickish, moderately broad to broad,
4-5 tiers of lamellulae present.
Stipe 3.5-8 cm long, 8-15(20) mm thick, concolorous with pileus,
stuffed becoming hollow, equal to ventricose, often plicate at apex, the
surface dry and velvety.
Spore deposit white; spores (7)8-10 X 7.5-9,, subglobose, globose, or broadly ellipsoid, prominences 0.5-0.8 u high; with broad bands
forming a reticulum, occasionally a few fine lines also present.
Basidia 52-58 X 7-9 u, 4-spored. Pleurocystidia: macrocystidia
38-63 X 6-11,u, clavate to cylindric, scattered, often absent.
Cheilocystidia 24-35 X 3-6.t, cylindric, to subfusoid, rarely capitate,
at times numerous or again absent. Gill trama of irregular cells. Pileus
trama heteromerous. Pileus cuticle of 2-4 layers of cells, bearing a turf
of pileocystidia, 25-50 X 3-7(12),u, cylindric, clavate or flask-shaped,
occasionally septate, yellowish brown. Stipe cuticle a brown zone 2-3
cells deep, bearing a turf of caulocystidia, 24-40 X 4-10,, versiform
(cylindric, clavate, bottle-shaped, ventricose), the subcuticular zone of
hyphae which are sometimes subgelatinous.
Note: "Second Type" from Albany; "Third Type" from Crogham,
Lewis Co. These agree with "First Type."