Observation 66221: Rhytisma punctatum (Pers.) Fr.
When: 2011-04-20
No herbarium specimen

Notes: This is what western Maple Tar Spot looks like in the spring, when the asci have formed and are releasing spores to infect the new maple leaves just budding.


This is a cross-section of a covered apothecium (a stroma – one of the tiniest dots in the main photo) of Rhytisma punctatum done in the spring when the asci and ascospores are mature. The stromatal lid has not yet eroded away so this section has been made about the same time as the spring m...

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Created: 2011-04-24 22:52:18 CDT (-0400)
Last modified: 2011-04-24 22:52:20 CDT (-0400)
Viewed: 39 times, last viewed: 2016-10-22 15:56:19 CDT (-0400)
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