A very orange bolete

Note the bright orange cuticle,
specially within the erosions.

North American Boletes: A Color Guide to the Fleshy Pored MushroomsAmong the many Boletes that we found on the last foray at Black Hills Regional Park were a couple very orange ones. The specimens we found were pretty mature and buggy but they were good enough for identification and still had a lot of the very orange color that was probably covering the whole pileus when it was young.
Date: 07/17/2011
Location: Black Hill Regional Park, Boyds, MDHabitat: solitary, growing on ground


Measurements

Note the short stipe which is stained brown.

pileus diameter - 66 mm
pileus height - 16 mm
stipe length - 40 mm
stipe diameter at apex - 18 x 38 mm
stipe diameter at middle - 19 x 27 mm
stipe diameter at base - 10 x 14 mm



Description
Pileus - irregularly shaped, somewhat flat, eroded,  erosions are bright orange while rest of cuticle is beige/tan, glabrous to velvety, context is white, smell is non-distinctive, taste is somewhat bitter
Hymenium - white/beige, with brown stains, bruises brown, pores are round to oval, tubes are 4.9 mm long
Stipe - compressed, central, solid (very buggy), tapering towards the base, white near the pore surface and stained brown with an orange tint near everywhere else. No ring or partial veil.
Spore print - not obtained

Note the brown stain at pore surface
and the brown stained stipe.

Impressions
This seems to be a specimen of Tylopilus ballouii. I did not observe any context staining. Apart from this, all the rest of the characteristics fit well with the description for this species. The fact that it was bitter, the orange color and that it stains brown when bruised are all suggestive of T. baloluii (Burnt-Orange Bolete). This is considered to be an edible but is reported to be sometimes bitter.



References
Boletes of North America: A Color Guide to the Fleshy Pored Mushrooms, page 26