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)
Recognized by sight: Eastern
Used references: Westcott’s Plant Disease Handbook 7th Edition

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
It was on jack pine…
By: Paul Derbyshire (Twizzler)
2014-05-07 10:44:16 CDT (-0400)

…not oak.

Created: 2009-05-30 00:28:02 CDT (-0400)
Last modified: 2013-05-31 17:52:13 CDT (-0400)
Viewed: 81 times, last viewed: 2016-10-28 20:14:05 CDT (-0400)
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