Observation 72511: Boletus innixus Frost

When: 2011-07-24

Collection location: Black Hill Regional Park, Boyds, Maryland, USA [Click for map]

Who: Michael Waisberg (waisberg)

No specimen available

Growing on soil, two specimens near each other, on oak forest

Pileus diameter – 56 mm
Pileus height – 15 mm
Stipe length – 61 mm
Stipe diameter at apex – 12 mm
Stipe diameter at middle – 12 mm
Stipe diamter at base – 14 mm tapering until 8 mm at the tip

Pileus – convex, smooth, dull, pale brown/beige, flesh is pale yellow, does not bruise when cut, odor is non-distinctive, taste is mild, perhaps slightly acidic.
Hymenium – bright yellow, does not stain, tubes are 3 mm long, pores are angular and approximately 0.6mm in diameter.
Stipe – central, nearly equal somewhat clavate, solid, light yellow, cuticle is glabrous and with shallow ribs, yellowish near the apex and brown near the base with a white tip at the far bottom, not reticulated, without ring or partial veil.

More details at: http://mushroompicker.blogspot.com/...


Proposed Names

-12% (4)
Used references: North American Boletes: A Color Guide to the Fleshy Pored Mushrooms
81% (4)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
B. flaviporus
By: I. G. Safonov (IGSafonov)
2011-07-24 10:05:26 -05 (-0500)

is a Western species — according to the big bolete book, it is known only from Cali and Oregon, where it grows September to April. I agree with Noah — this looks very much like our east coast B. innixus.

I still think it is flaviporus
By: Michael Waisberg (waisberg)
2011-07-24 08:44:46 -05 (-0500)

Most probably this mushroom is a Boletus flaviporus. Other look alikes are B. innixus and B. auriporus (which by the way was our first guess). B. innixus has a non-distinctive flavor and a short (3-6 cm long, 1-1.6 cm thick at apex and up to 2.5 cm at base) club shaped stout stipe (the measurements of my specimen could perhaps follow under this definition) while B. flaviporus is supposed to have an acidic flavor and to have a long (1-3 cm long), thick (1-3 cm) and nearly equal or tapered in either direction stipe (my specimen was nearly equal). B. auriporus has appressed microfibrils on pileus and it stains brick-red (slowly) when bruised while B. flaviporus is subtomentose to glabrous and does not stain when bruised. The distinction between B. flaviporus and B. innixus does not look very simple to me, perhaps the flavor is the best characteristic to separate this two species but even this is not so obvious (I felt only a mild acidic flavor). In any case, all three species are edible.

Created: 2011-07-23 23:51:11 -05 (-0500)
Last modified: 2011-07-24 19:47:01 -05 (-0500)
Viewed: 87 times, last viewed: 2019-02-14 11:45:45 -05 (-0500)
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