Spherical or cobblestone-like or spotted/pimpled crust <perithecial>


The bulk of the fungi in this sub-group produce perithecia as fruit bodies. A perithecium is a roughly spherical chamber within which you find the spore producing organs and there is an apical hole (or ostiole) through which the spores escape from the perithecium. In many species you see the ostiole as a tiny, pimple-like protrusion (and sometimes you will need a handlens to see it clearly).

 

Perithecia are small, from under a millimetre to about 2 millimetres in diameter. Mostly they are black and hard (but brittle – apply enough pressure and you’ll shatter one), however, there are also soft or coloured perithecia.

 

They may appear sparsely over the wood, in gregarious colonies (but with the individual perithecia still clearly distinct) or in stromata. In a stroma the perithecia are embedded within a communal matrix. Stromata may be two dimensional (e.g. a crust or cushion on the wood) or three dimensional (e.g. a golfball-sized lump on the wood). In some stroma-forming species you find a pigmented layer making up the outer surface of the stroma.


Spherical or cobblestone-like or spotted/pimpled crust <perithecial>

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Discussion

Heinol wrote:
2 hrs ago
This is one of the Rosellinia species with a well-developed and persistent subiculum. The subiculum is a mat-like growth of brown fungal hyphae on the surface of the wood and asexual spores are produced on the subicular hyphae. The subiculum develops first and later the more-or-less globose perithecia (each within a dark, blackish-brown shell) push out through the subiculum and sexual spores are produced in the perithecia. In some species of Rosellinia the subiculum is present only in young material and disappears (or at best becomes very scanty) as the perithecia mature.

Rosellinia sp.
Heinol wrote:
20 Jun 2025
Possibly something in the Phellinus line - still developing.

Hypoxylon howeianum
Heinol wrote:
10 Apr 2025
Probably an immature polypore -perhaps Postia pelliculosa, but at this stage I can't be sure.

Unverified Spherical or cobblestone-like or spotted/pimpled crust <perithecial>
Heinol wrote:
9 Apr 2025
The branched asexual state is also present.

Hypoxylon howeianum
Teresa wrote:
16 Jan 2025
This was sent to Orange and Dr M.Priest reported back with Biscogniauxia sp.

Biscogniauxia sp. (not discoid/cup-like)
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