Observation 8795: Tuber gibbosum Harkn.

When: 2001-06-03

Collection location: near View, Clark Co., Washington, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Collected near View, Clark County, WA in a young (30 year old) stand of Douglas fir. These are relatively young specimens of T. gibbosum, which can have a chocolate-brown to nearly black gleba when mature. This species was first reported from the San Francisco Bay area in the 1880’s (Harkness data). It is now known to be species specific with Douglas fir. Mature specimens have been found as early as December in Vancouver, Clark County, WA; and as late as July in Clackamas County, OR. It appears to be most abundant in May and June. Dr. James Trappe has confirmed that this is the original collection of Tuber gibbosum, which varies from T. oregonense in its fruiting time (usually late winter/early spring); gleba coloration (chocolate-brown to nearly black in mature and/or dried specimens), wider venae externae, and a curious donut-shaped spore with central depressions on either side, like it has been pinched.

[admin – Sat Aug 14 02:03:38 +0000 2010]: Changed location name from ‘Near View, Clark Co, WA’ to ‘near View, Clark Co., Washington, USA’

Species Lists


Pen knife in photos is 3.5 inches long for scale.
Pen knife in photos is 3.5 inches long for scale.
Pen knife in photos is 3.5 inches long for scale.

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