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Octospora pulchrispora Sochorová & Eckstein
Czech Mycology 76: 51 (2024)
MycoBank: MB 852169
Type: Czech Republic, Sloup v Čechách (Česká Lípa District, Liberec Region), forest theatre, 50°43'57.4" N, 14°34'56.5" E, 325 m a.s.l., on Cynodontium polycarpon on a sandstone rock, 28 October 2020, leg. Z. Sochorová (ZS 99/2020 (holotype PRM 956942)
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| 1: Octospora pulchrispora, apothecium, holotype, image by Z. Sochorová |
2: Octospora pulchrispora, spores in cotton blue, holotype |
Apothecia: initially globose or barrel-shaped, later turbinate to saucer-shaped, sessile, pinkish-orange, with a narrow margin, 0.8-1.3 mm broad, up to 0.7 mm high, hymenium plane, roughened by protruding asci, margin thin, irregular, paler than the disc, often raised up, hairless
Subhymenium 12-20 µm thick, individual cells of variable shape, thin-walled, 6.5-12 x 4.5-8 µm.
Medullary excipulum composed of textura intricata, in the thickest part up to 180 µm thick, at flanks 72-110 µm, individual cells cylindrical, 16-57.5 x 4-18 µm
Excipulum: at base 90-180 µm thick, at flanks 35-90 µm, inner layer composed of textura angularis-globosa, subhyaline, with cells thin-walled, 8-35 x 7-22 µm, the outer layer of t. angularis-prismatica, pale orange, cells thick-walled, (7) 14-27 (30) x (4) 8-13 (20) µm
Paraphyses: filiform, septate, without vacuolar bodies, apical cells uninflated cylindrical to clavate, mostly bent, 30-100 x 5-10 µm, lower cells 3-3.7 µm wide, sometimes anastomosing or having short lateral projections, sometimes wavy in lower parts, only with a low content of carotenoid pigment which is most concentrated in the top of the apical cell and turns green in IKI
Asci: cylindrical, 278-380 x 20-26 µm, operculate, inamyloid, containing 8 ascospores with uniseriate or less often subbiseriate arrangement, pars sporifera 98-117 µm
Ascospores: (vital) ellipsoid, less often broadly ellipsoid or narrowly ellipsoid, thin-walled, hyaline, (16.2) 17.2-19.7 (20.8) x (10.8) 11.4-13.6 (14.9) µm, Q = 1.49-1.6, containing a single large lipid body, ornamentation consisting of branched, straight or curved ridges 0.2-0.7 µm wide, 0.2-0.8 µm high
Host: Cynodontium polycarpon
Infectious structures: infects the rhizoids, causing the rhizoid cell to swell and to form a one-celled, spherical to pyriform gall in terminal position. The galls measure 30-65 (80) µm in diameter and have hyaline walls contrasting in colour from the brown unaffected rhizoid parts. At first, the galls are only partly covered by hyphae 4-7 µm wide, which are later glued together forming a complete coat around the gall
Habitat: on shaded sandstone rocks between shoots of the host
Distribution: Czech Republic
References:
- Sochorová Z., Eckstein J. & Sochor M. 2024. Octospora pulchrispora (Pezizales) – a new bryophilous species on Cynodontium polycarpon. - Czech Mycology 76: 45-62. DOI
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| 3: Octospora pulchrispora, spores in water, holotype |
4: Octospora pulchrispora, infection, spherical gall with surrounding hyphae (fungal cells dottet), holotype |
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