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

Subgenus Tristes

389

trama reviving poorly but no rosettes evident; lactifers hyaline-yellowish, content granular, inconspicuous. Pileus trama not reviving well,
some evidence of rosettes present. Pilear cuticle an ixocutis of tangled
to ascending septate branching narrow hyphae in a zone of KOH-soluble slime, in Melzer's the slime zone up to 40, thick; hyphal incrustations observed on youngest specimens, abundant in some areas, nearly
absent on old pilei. Stipe cuticle a thin layer of hyaline scarcely refractive hyphae, no slime visible in KOH or Melzer's (stipe surface obviously dry at first, possibly lubricous when wet).
Observations.-Peck's illustration accompanying the type, the
type specimens themselves, the latex drying green (per Peck), the
taste, and the presence of hyphal incrustations and debris, all clearly indicate that the collection belongs in the collection of variants here referred to as L. vietus.
Material cited.-ALASKA: Wells-Kempton 2946, 2948, 5448, 5897
(all MICH); COLORADO: Smith 85269; IDAHO: Smith 53617, 53783,
60034, 65640, 76134, 81848, 81849, 81851, 81949, 82302, 82304, 82340,
82457, 82537, MAINE: Bigelow 4453, 4552, 4672, 4759 (all MICH);
Homola 5760 (MICH); Litten L563 (MICH); MASSACHUSETTS:
Bigelow 8704, 14898 (all MASS); MICHIGAN: Hoseney, Oct 20,
1973, 2761, 2763, 2765, 2766, 2767, 2901 (all MICH); Patrick 3057,
3284 (all MICH); Smith 23508, 23509, 33709, 34175, 34179, 38593.
50554, 57669, 58094, 62400, 67620, 67629, 84630, 84726, 84732, 84748,
84751, 85371, 85397, 85423, 85435, 86502; N. J. Smith 1823 (MICH);
NEW YORK: Peck, Sandlake and Grieg, August-September (type of
L. parvus, NYS); Peck, from Karner, September (type of L. varius,
NYS); Peck, Grieg (type of L. trivialis var. gracilis, NYS); Smith 248;
NORTH CAROLINA: Smith, September 14,1974; WISCONSIN: Weber
4267, 4270, 4271 (all MICH).
Canada. NOVA SCOTIA: Harrison 7886, 11850, 11873, 11960,
12071, 12098 (all MICH); ONTARIO: Malloch 11.9.73/13, 11.9.73/24
(all TRTC); Smith 4523, 4758; QUEBEC: Malloch 31.8.76/13, 31.8.76/
20 (all TRTC).
Europe. AUSTRIA: Moser (TENN 25119); ENGLAND: Smith
63249, 80481; THE NETHERLANDS: Bas 620, 4802 (L); Maas Geesteranus 8006 (L); SWEDEN: Haglund 197 (MICH); Lundell & Nannfeldt
2351 (S); Petersen (TENN 35725, 35728).
137. Lactarius pungens sp. nov.
Pileus 2.5-3.5 cm latus, "cinnamon-drab," azonatus, viscidus. Latex albus, constans, lamellas nullo modo tingens, gustu acer. Lamellae
"pale ochraceous-buff," confertae, angustae. Stipes "light ochraceousbuff" siccus. Sporae 7-9.5(10.5) X 6-8.5 ju. Specimen typicum in Herbar