Observation 135951: Xylaria Hill ex Schrank
When: 2013-06-04
No herbarium specimen
0 Sequences

Notes:
Found in Pacific University Arboretum, growing on a decorticated log in a mixed forest.

Spores 11-12 × 5 microns.

Proposed Names

26% (3)
Eye3
Recognized by sight
57% (1)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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notes on X. hypoxylon
By: Danny Newman (myxomop)
2017-10-24 15:51:35 CDT (-0400)

from Fournier, Jacque. “Update on European Species of Xylaria,” 2014 (PDF)

Perithecia subglobose  (G),  0.4‐0.7  mm  diam,  immersed  to  slightly 
exposed. 
Ostioles raised‐discoid,  160‐280  µm  diam,  grey  brown  to  black,  with  a 
low conical papilla at the center (I).”

the perithecia here are very exposed to the point of being mammiform. The spore description is as follows:

“ellipsoid inequilateral with narrowly to broadly rounded ends,
medium brown, smooth, devoid of cellular appendage at
maturity, containing two large guttules, with a very
conspicuous straight, rarely slightly sinuous germ slit
1/2-4/5 spore-length on the flattened side (L-P). Atypical
ascospores with acute ends, slightly oblique or sinuous germ
slits located next to one end or on the convex side can be
encountered in some collections.”

knowing more about the germ slit in your material would be helpful. the size and shape of the spores otherwise appear to fit, as does the flattened, sterile apex of the stromata and the hairy stipe. I would still doubt X. hypoxylon, however, on the basis of the perithecial shape and general surface ornamentation, but then again perhaps this is not a dealbreaker for that sp. Werdnus?

Created: 2013-06-09 20:07:47 CDT (-0400)
Last modified: 2017-10-24 15:51:50 CDT (-0400)
Viewed: 36 times, last viewed: 2017-11-18 21:54:51 CST (-0500)
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