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

384

THE BOLETES OF MICHIGAN

elements short and enlarged and becoming aggregated into fascicles
(which are the squamules), content yellowish to hyaline in KOH. Context composed of hyphae interwoven, inamyloid, thin-walled and cells
inflated at times to 20 p wide. Caulohymenium of basidia and cystidia,
the cystidia fusoid-ventricose to nearly clavate, mostly hyaline. Clamp
connections absent.
Habit, habitat, and distribution.-Solitary to scattered on humus
usually under oak, often along openings in woods or scattered in thin
woods, late summer. Generally rare, but found in quantity at times in
the oak-pine barrens from Roscommon to Topinabee.
Observations.-This is a most easily recognized species in every
respect. The conspicuously lacerate-reticulate reddish stipe, the areolate
pileus, characteristically long stipe with a viscid base when perfectly
fresh, and the longitudinally winged spores are all important features.
Boletus projectellus has shallower reticulations over the stipe, and the
edges of the veins forming them are not lacerate or broken. Under the
microscope the spores readily distinguish them, for they are smooth in
B. projectellus.
Material examined.-Barry: Smith 73157. Cheboygan: Smith 38891,
39269, 62940, 62966, 64855, 8-5-51; Thiers 3748, 3839. Gratiot:
Potter 2880, 3802, 7643, 7846, 7974, 11246, 13970. Livingston: Smith
18609. Luce: Smith 38076. Marquette: Kauffman 1580. Oakland: Smith
7112, 7270, 15204. Ogemaw: Shaffer 2711; Smith 67572. Washtenaw:
Hoseney 194; Rea 766; Shaffer 2659, 2754; Smith 1713, 1734, 18562,
18666, 64178; Thiers 4324.
207. Boletellus pseudo-chrysenteroides Smith & Thiers, sp. nov.
Illus. Fig. 113; PI. 152.
Pileus 5-10 cm latus, late convexus, siccus velutinus demum areolatus, obscure roseus, demum olivaceus. Contextus laete luteus tactu
caeruleus. Tubuli 8-12 mm longus, lutei tactu caerulei; pori lati (1-1.5
mm), lutei tactu caerulei. Stipes 6-9 cm longus, 9-14 mm crassus,
solidus, intus luteo-virgatus tactu caeruleus; extus roseo-pruinosus, sursum
luteus, deorsum melleus. Sporae 11-14 X 5.5-7 (8),u, longitudinaliter
striatus. Specimen typicum in Herb. Univ. Mich. conservatum est; prope
Manchester, September 15, 1961, legit Smith 64264.
Pileus 5-10 cm broad, broadly convex expanding to plane or
nearly so; surface dry and velvety when young, soon becoming areolate
as in B. chrysenteron; dark rose-red overall ("Pompeian-red") and at first
on the tufts of the epicutis adorning the areolae but the tufts slowly