Leccinum cartagoense (Wolfe & Bougher) Halling & Mueller in Halling, Kew Bull. 54: 747. 1999.
Pileus 3.58 cm broad, at first convex, with age plano-convex, dry to moist; disc even, at first camel brown to cinnamon brown to cocoa brown to gray brown, then tan; margin even, when young camel brown to cinnamon brown to cocoa brown to gray brown (with pink overtones), then tan or pink; surface matted tomentose to subtomentose to tomentose, becoming matted subtomentose to matted tomentose; maculose color spots present, when young rosy pink; sterile appendiculate flaps absent. Flesh 610 mm thick, white with thin dark pink zone under pileus surface, staining absent; odor mild; taste mild. Hymenophore tubulose, depressed to deeply depressed. Tubes 710 mm long, yellowish white, becoming grayish brown to pale pink, pale brown when injured; pores up to 1 mm wide, flesh pink or white, unchanging when injured or pale brown when bruised. Stipe 3.511 cm long, 615 mm wide, equal, dry; upper half when young finely scabrous, white, with age finely subscabrous, white; lower half when young scabrous to subscabrous ridged, white, with age finely subscabrous to scabrous, white; scabers on upper half when young rosy pink, with age dull pink to gray, on lower half when young rosy pink, with age dull pink to gray to gray brown; base chrome yellow, staining not present. Stipe interior solid; flesh above when young white, with age white, staining blue (very rarely); flesh at base when young cadmium orange to chrome yellow, with age cadmium orange to chrome yellow, staining not present. Basal mycelium yellow.
Basidiospores pinkish brown (wood brown), 11.214 µm long, 4.25.2 µm wide, mean Q = 2.58, smooth, subfusoid to fusoid to ellipsoid, inamyloid, with KOH golden yellow. Basidia 2035 µm long, 8.512 µm wide, clavate, hyaline, 4 -sterigmate. Hymenial cystidia 4764 µm long, 811 µm wide, more common towards edge of tubes, thin walled, with golden colored contents, fusoid to ventricose, gelatinization absent, encrusting pigment absent. Tube trama boletoid, hyaline, lateral strata elements 2.810.5 µm wide, not gelatinized. Pileipellis hyphae a trichodermium and interwoven, in KOH brownish, inamyloid; elements 2.88.4 µm wide, cylindric to subelongate to elongated, smooth, thin walled, granular content absent, not gelatinized. Pileus trama interwoven, hyaline, inamyloid, with elements 512 µm wide, smooth, thin walled. Stipitipellis hyphae vertically oriented, parallel, giving rise to clusters of caulocystidia, 2156 µm long, 810 µm wide, clavate to ventricose or lageniform (often secondarily septate and with a long mucro), with golden yellow contents or hyaline, with incrusting pigment absent. Stipe trama hyphae parallel, cylindric, hyaline, inamyloid. Clamp connections absent.
Mycorrhizal host: Quercus.
Originally described from one collection on the western slope of Volcan Irazu, Leccinum cartagoense is encountered routinely in the Cordillera Talamanca and at Volcan Poas in the Cordillera Central. The fine pink scabers on the stipe surface and the intense chrome yellow stipe base are diagnostic. Originally described as a Tylopilus (because of the pinkish flesh colored spore deposit), it is related to T. (or L.) chromapes (see image chromap.jpg) of the Northern Hemisphere, but lacks the intense pink color of the pileus and is smaller in stature. There is a rare entity (see image subcart.jpg) of this group in Costa Rica that has a black pileus and seems to lack pink colored scabers on the stipe. Additional material is needed to assess the autonomy of this latter form.
Cite this publication as: Halling, R. E., G. M. Mueller, and M. J. Dallwitz. 1998 onwards. Leccinum and Phylloporus in Costa Rica: Descriptions, Illustrations, Identification, and Information Retrieval. Version: 13 Decmber 2006. http://www.nybg.org/bsci/res/hall/deltaindex.html. Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993 onwards, 1998) should also be cited (see References).