The boletes of Michigan, by Alexander H. Smith and Harry D. Thiers.

LECCINUM

201

cutis of appressed hyphae 5-9, wide, content ochraceous to yellowbrown in KOH, homogeneous, cells elongate (more than 4 times as long
as wide), apical cell tapered to a subacute apex, midportion not inflated,
wall smooth or nearly so, in Melzer's the cell content near "argusbrown" (a bright yellow-brown), homogeneous to granular; hyphae of
subcutis and adjacent context orange in Melzer's. Clamp connections
absent.
Habit, habitat, and distribution.-Under birch, Lower Falls,
Tahquamenon Falls State Park, Chippewa County, July 8, 1968, Mary
Wells and W. Patrick (Smith 75513).
Observations.-The outstanding features of this species are the pale
pileus which becomes minutely squamulose to rimulose, the very fine
sparse stipe ornamentation, the slow change to pink in the apex of the
stipe as well as in the pileus when a basidiocarp is sectioned, the lack of
pigment globules in mounts of cuticular hyphae in Melzer's, and the
orange reaction of the subcuticular hyphae and those adjacent to it in
the context. It is at once distinguished from L. scabrum in the field by
the change to pink on the cut surfaces as mentioned, and the fine,
sparse, ornamentation of the stipe. It is intermediate between subsections Scabra and Pallida, but is placed in the former because as dried the
pileus is pale avellaneous. The ground color of the stipe remains pallid
throughout in drying.
101. Leccinum pallidistipes Smith & Thiers, sp. nov.
Pileus 5-10 cm latus, convexus, siccus demum viscidus, glaber, sordide cinnamomeus. Contextus pallidus, tactu pallide vinaceus. Tubuli 1-2
cm longi pallidi; pori cinerei-pallidi tactu luteobrunnei. Stipes 9-14 cm
longus, 1-2 cm crassus, sparse punctatus; punctae pallidae, tarde griseae.
Sporae 15-18 X 5-6 /. Specimen typicum in Herb. Univ. Mich. conservatum est; prope Brimley, Chippewa County, July 13, 1968, legerunt
H. D. Thiers et W. Patrick (Smith 75572).
Pileus 5-10 cm broad, convex to broadly convex, the margin even;
surface dry at first, becoming viscid later, glabrous, color near "Sayalbrown" (dull cinnamon) on the disc, the margin pallid at first, in age
dull cinnamon ("Verona-brown") over the disc and with pallid blotches
toward the margin, pale gray-brown as dried, some obscurely fibrillosespotted near the margin. Context thick, pallid, when cut staining slightly
vinaceous-brown (reddish by a Mazda bulb) FeSO4 on context bluish;
odor and taste not distinctive.