When: 2010-05-17

Collection location: Madison, Dane Co., Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available


Proposed Names

8% (2)
Used references: Thompson, 2003, Lichens of Wisconsin

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= Observer’s choice
= Current consensus


Add Comment
That’s perseverance for you!
By: Jason Hollinger (jason)
2011-10-05 12:02:56 PDT (-0700)

Congratulations on finally getting to the bottom of this. I agree, this does look a lot like Hypoxylon mammatum… more than Megaspora.

I’ll be a party pooper
By: Andrew Khitsun (Andrew)
2011-10-04 20:56:43 PDT (-0700)

I’ve just gotten an old book on tree diseases and have come across a photo of Hypoxylon mammatum (or H. pruinatum) – Hypoxylon Canker of aspen. It looks like this one. I’ve compared all the images I could find of this Hypoxylon and Megaspora verrucosa – the fungus wins. I actually have a specimen (from different location) that can be tested.

Neat! Good eye
By: Jason Hollinger (jason)
2011-04-20 16:59:57 PDT (-0700)

And thanks for putting a name to it, Chris!

Megaspora verrucosa
By: Chris Parrish (kitparrish)
2011-04-19 23:12:33 PDT (-0700)

This is a lichen with a whitish, crustose, warty (verrucose) thallus, growing on poplar bark, without soredia or isidia, and with abundant blackish immersed apothecia, which suggests Megaspora verrucosa. Thompson (2003, p.140) says “Apothecia immersed in areoles, appearing like Pertusaria, disk deeply concave, at first osteolate, becoming broader with a thin darkening border around the mouth within the thalloid margin; disk black.”

Compare with these photos of Megaspora verrucosa by the Stridvall’s, and a few more photos of Megaspora verrucosa by Einar Timdall.

Thompson, 2003, Lichens of Wisconsin

By: Andrew Khitsun (Andrew)
2011-04-19 20:57:28 PDT (-0700)

I think it might be a lichen. It was growing on the poplar tree (see bottom photo)