Mushroom Observer: Observation 27466: Rhizopogon occidentalis Zeller & C.W. Dodge

Observation 27466: Rhizopogon occidentalis Zeller & C.W. Dodge

When: 2009-10-27

Collection location: San Rafael, Marin Co., California, USA [Click for map]

Who: Ken Stavropoulos (pennybun)

No specimen available

Notes:
under pine

[admin – Sat Aug 14 02:05:34 +0000 2010]: Changed location name from ‘San Rafael, CA’ to ‘San Rafael, California, USA’

About Rhizopogon occidentalis Zeller & C.W. Dodge

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Proposed Names	User	Community Vote
*Fungi* Bartl.	pennybun	61% (2)
Recognized by sight
*Rhizopogon* Fr. & Nordholm	nathan	75% (2)
Recognized by sight: The threads on the outer surface and the spongy inside point to Rhizopogon, perhaps R. occidentalis. I leave it to the trufflers to propose a species.
*Rhizopogon occidentalis* Zeller & C.W. Dodge	Tuberale	84% (1)
Recognized by sight: NOTE: Must be associated with either 2- or 3-needle pine to be R. occidentalis. Rhizomorphs are yellowish to light reddish, but overall peridium composed of felt-like matt of tiny yellow to light buff rhizimes with larger, vein-like rhizomorphs; gleba does not appear to have much coloration, so probably immature. However, since a single Rhizopogon may produce millions if not billions of spores, it is still likely that at least some mature spores could be found in the gleba. Often visible slightly erumpent, but typically mostly hypogeous, often in sandy or well-drained soils. I have found it with Pinus contorta and Pinus ponderosa, but it is known from other 2- and 3-needle pines. Used references: Field Guide to North American Truffles, p. 76

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= Observer’s choice

= Current consensus

Proposed Names

Fungi Bartl.

pennybun

61% (2)

Recognized by sight

Rhizopogon Fr. & Nordholm

nathan

75% (2)

Recognized by sight: The threads on the outer surface and the spongy inside point to Rhizopogon, perhaps R. occidentalis. I leave it to the trufflers to propose a species.

Rhizopogon occidentalis Zeller & C.W. Dodge

Tuberale

84% (1)

Recognized by sight: NOTE: Must be associated with either 2- or 3-needle pine to be R. occidentalis. Rhizomorphs are yellowish to light reddish, but overall peridium composed of felt-like matt of tiny yellow to light buff rhizimes with larger, vein-like rhizomorphs; gleba does not appear to have much coloration, so probably immature. However, since a single Rhizopogon may produce millions if not billions of spores, it is still likely that at least some mature spores could be found in the gleba. Often visible slightly erumpent, but typically mostly hypogeous, often in sandy or well-drained soils. I have found it with Pinus contorta and Pinus ponderosa, but it is known from other 2- and 3-needle pines.

Used references: Field Guide to North American Truffles, p. 76

Propose Another Name

Please login to propose your own names and vote on existing names.

= Observer’s choice

= Current consensus

User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.

Vote

Score

Weight

Users

I’d Call It That

3.0

4.98

Promising

2.0

0.00

Could Be

1.0

4.94

(nathan)

Doubtful

-1.0

0.00

Not Likely

-2.0

0.00

As If!

-3.0

0.00

Overall Score
sum(score * weight) /
(total weight + 1)

1.82

60.69%

User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.

Vote

Score

Weight

Users

I’d Call It That

3.0

4.60

Promising

2.0

4.94

(nathan)

Could Be

1.0

0.00

Doubtful

-1.0

0.00

Not Likely

-2.0

0.00

As If!

-3.0

0.00

Overall Score
sum(score * weight) /
(total weight + 1)

2.25

74.88%

User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.

Vote

Score

Weight

Users

I’d Call It That

3.0

5.08

Promising

2.0

0.00

Could Be

1.0

0.00

Doubtful

-1.0

0.00

Not Likely

-2.0

0.00

As If!

-3.0

0.00

Overall Score
sum(score * weight) /
(total weight + 1)

2.51

83.54%

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