Observation 35002: Bacidia schweinitzii (Fr. ex E. Michener) A. Schneider
When: 2010-03-18
No herbarium specimen

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Could be odd-color form of Bacidia schweinitzii
By: Jason Hollinger (jason)
2010-03-22 19:45:00 PDT (-0700)

I ran across something like this at the Tuckerman workshop. When I dissected it I found those cool super-long many-septate spores typical of Bacidia schweinitzii along with the red-brown hypothecium. I was stumped by it until Richard Harris explained that B. schweinitzii is renowned for being incredibly variable with respect to apothecia coloration. Typical form is the pitch-black thing you’re probably familiar with; but this rust-colored form is not uncommon, and even fully albino ones are known to occur. The crust can be anywhere from thin and smooth to almost leprose like this. (Pyrrhospora russula — now called Ramboldia russula, by the way — never has a crust like this. But do keep a look out for Pyrrhospora varians, which is similar to R. russula, but with brown apothecia instead. More common than you’d think, it’s just so nondescript I tend to overlook it.)

Update: Wow, the second photo is spectacular, showing the two forms growing side-by-side!

Created: 2010-03-22 19:10:57 PDT (-0700)
Last modified: 2010-03-22 19:10:57 PDT (-0700)
Viewed: 41 times, last viewed: 2016-10-24 02:28:12 PDT (-0700)
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