Bryoparasitic Pezizales

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Octospora mnii Döbbeler & Facher
Karstenia 54: 50 (2014)
Octospora mnii, apothecium Octospora mnii, spores
1: Octospora mnii, apothecium in protonema of Rhizomnium punctatum, image by Döbbeler & Facher 2: Octospora mnii, spores, image by Döbbeler & Facher
Apothecia: 0.3-0.6 mm long and 0.2-0.6 mm wide, first barrel-shaped later forming a flat rimless disc, colourless to yellowish
Paraphyses: filamentous, not ramified, apically slightly widened to 5–8 µm
Asci: 150–230 x (13–)15–19(–22) µm, 8-spored, spores uniseriate
Ascospores: subglobose to ovoide or broadly ellipsoid, (13-)14-17(-19) x (9.5-)10-13(-14) µm, colourless, with one large, globose droplet, epispore delicately rough and cyanophilous
Host: Rhizomnium punctatum
Infectious structures: infects the persistent protonema, appressoria 25–50 µm long, 10–27 µm high and 21–26 µm wide, 1-2(-3) septate
Habitat: on decaying logs in shaded situations, growing in the dense, persistend protonema of Rhizomnium punctatum
Distribution: Germany (BY)

References:
  • Döbbeler, P. & Facher, E. 2014. Octospora mnii (Pezizales), a new ascomycete on the persistent protonema of Rhizomnium punctatum. - Karstenia 54: 49-56.
Images:
Octospora mnii, appressorium Octospora mnii, appressorium
3: Octospora mnii, appressorium on protonemal filament, image by Döbbeler & Facher 4: Octospora mnii, infectious structure, image by Döbbeler & Facher

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