Observation 21419: Cronartium quercuum (Berk.) Miyabe ex Shirai
When: 2009-05-29
No herbarium specimen

Notes: I’m not even sure this is a fungus. It’s enclosing a twig found in Zone 15, the jack pine stand that produced all those trichs and boletes last fall.

First photo is a thumbnail made from the second. A much higher resolution picture of this stuff can be had from my similar find in Zone 12 ( http://www.mushroomobserver.org/21423 ).

Proposed Names

33% (2)
Used references: Ziller, W. G. 1974. The Tree Rusts of Western Canada. Canadian Forestry Service Pub. No. 1329. Pacific Forest Research Centre, Victoria, B. C. 272p.
55% (1)
Eyes3
Recognized by sight: Eastern
Used references: Westcott’s Plant Disease Handbook 7th Edition

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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It was on jack pine…
By: Paul Derbyshire (Twizzler)
2014-05-07 09:44:16 CDT (-0500)

…not oak.

Created: 2009-05-29 23:28:02 CDT (-0500)
Last modified: 2013-05-31 16:52:13 CDT (-0500)
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