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

BOLETUS

289

throughout the state in the summer and fall, but not usually found in
quantity in any one place.
Observations.-This species has usually passed under the name
Boletus chrysenteron in North America (see Coker and Beers, 1943). It is
certainly common in Michigan. Also, it is very easy to get mixed collections of the two since they resemble each other so closely macroscopically and fruit in the same habitat at the same time of the year.
Material examined.-Barry: Mazzer 4060. Chippewa: Smith 67089,
67184, 67113, 67236, 73030. Cheboygan: Smith 57297, 67004.
Emmet: Smith 67031; Thiers 3533, 3595. Gratiot: Potter 3723,7763.
Livingston: Smith 72597. Luce: Smith 72376. Montmorency: Smith
66996. Oakland: Smith 67327, 73280. Washtenaw: Smith 62671,
64056, 73110.
151. Boletus patriciae Smith & Thiers, sp. nov.
Illus. P1. 106 (upper).
Pileus 4-5 cm latus, convexus, udus demum impolitus, olivaceobrunneus demum olivaceo-griseus. Contextus pallide luteus tactu caeruleus. Sapor amarus vel subamarus. Tubuli lutei; pori 2 per mm, pallide
lutei tactu tarde caerulei. Stipes 4-5 cm longus, 9-12 mm crassus, pallide
luteus, derosum roseus. Sporae 11-15 X 5-6.5,, truncatae. Specimen
typicum in Herb. Univ. Mich. conservatum est; prope Highlands, Oakland County, August 26, 1966, legit Smith 73236.
Pileus 4-5 cm broad, plano-convex, surface moist but dull and
unpolished, evenly dark olive-brown fresh and moist, slowly paler olivebrown and finally olive-gray along the margin, no red showing. Context
yellowish pallid young, becoming pale olive-buff to pallid, when cut
soon staining blue but soon flushed rose and slowly rose-red around
larval tunnels, odor unpleasant, taste disagreeable and bitterish, FeSO4
slightly olive on context.
Tubes dull pale yellow aging to olive-buff, up to 1 cm long, depressed around the stipe; pores 2 per mm, pale yellow becoming yellowish olive, slowly staining dingy blue where bruised and these areas changing to brown.
Stipe 4-5 cm long, 9-12 mm thick, solid, yellowish pallid within
near apex and dull rose in lower half or just in the base; surface rose-red
and finely pruinose to apex, coated with olive-buff mycelium over the
base.
Spores 11-15 X 5-6.5 p, smooth, apex truncate but not notched,
in Melzer's showing a fleeting-amyloid reaction when fresh, as revived