Bryoparasitic Pezizales

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Octospora tucumanensis Catania & G.M.Suárez
Mycological Progress 22: 8 (2023)
Type: Argentina, Tucumán, San Miguel de Tucumán, 26°49'31''S 65°13'24''W, 450 m asl., on Dimerodontium balansae, 28 Apr 2021, G. Suárez 1929 (holotype LIL159229)
Apothecia: scattered to gregarious, first spherical, later urceolate, rounded from the top view, sessile, (0.3)0.5–0.8 mm in diameter, hymenium orange, margin lacerate; receptacle and margin lighter, orange furfuraceous, covered by short hyaline hairs; at the base with numerous hyaline, branched hyphae; growing on stems of the host moss
Subhymenium: composed of textura intricata-epidermoidea, cells 3.5–4.5 µm wide, thin-walled, hyaline, guttules containing orange pigment
Medullary excipulum: of textura intricata with cells 6.0–8.0 µm wide, thin-walled, hyaline. Subhymenium together with medullary excipulum contain orange pigment guttules
Ectal excipulum: from base to flank of textura angularis, cells 4.5–18 µm in diameter, hyaline, angular, subglobose or irregularly shaped
Hairs: 5–8.5 µm wide, thickwalled, hyaline, septate, with obtuse apices
Paraphyses: cylindrical, straight to slightly sinuous, sparsely branched (bifurcate), septate, last cell slightly inflated, with multiple yellow orange guttules; apical cells 21–27 x 4.5–5.5 µm, cells below narrower, 2.5–3.5 µm wide
Asci: cylindrical, 107–130(137.5) x 12.5–15 µm, 8-spored, spores uniseriate, pars sporifera (85.5)90–115(125) µm
Ascospores: subglobose, 11–12.5 (13) x 10–11.5(12.5) µm (ornamentation not included), Q = 1.06, hyaline, always with a large lipid body, 8–9 µm diameter, accompanied by some small lipid bodies, 2–4.5 µm in diameter. Ornamentation consisting of two types of warts: 1) large warts with rounded ends, constricted in the basal or middle zone, 1.2–1.5 µm high and 0.6–0.8 µm broad; and 2) small, regularly distributed, slightly conical warts, 0.3–0.4 µm high and 0.25–0.3(0.35) µm broad. Warts with striated surface
Host: Dimerodontium balansae
Infectious structures: induces galls on the apical cell of rhizoids, the surface of the galls is completely coverd with thick-walled hyphae
Habitat: at urban and rural sites growing directly on the host
Distribution: Argentina


References:
  • Suárez, G. M., Dominguez, F. G., Pajot, H., Flores, J. R. & Catania, M. del V. 2023. Octospora tucumanensis (Pezizales), a new bryophilous ascomycete on Dimerodontium balansae (Bryophyta) from Argentina. - Mycological Progress 22: 54. DOI

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