Bryoparasitic Pezizales

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Octospora sulcatispora Ribes, Martínez-Gil & M.Vega
Ascomycete.org 16(3): 239 (2024)
MycoBank: MB 854925

Type: Spain, La Rioja, Munilla, La Monjía, 42°13’55.0” N 02°23’02.5” W, 1172 m a.s.l., on ground, 10 Nov. 2023, leg. R. Martínez-Gil (holotype VIT-MYCOTHECA-9784)
Octospora sulcatispora Octospora sulcatispora
1: Octospora sulcatispora, apothecia, holotype, image by R. Martínez-Gil 2: Octospora sulcatispora, SEM image of spores, Spain, Andalucia leg. 2016-12-03 M. Á. Ribes (AH-44752)
Apothecia: growing solitary or in groups on soil among the host moss, globose when young, later barrel-shaped or cup-shaped, sessile, orange, up to 0.5–0.8 mm in diam, with inconspicuous margin
Paraphyses: septate, slender, mostly straight, some slightly bent and occasionally bifurcated, apical cell not or only slightly inflated (19–)27–37(–40) x (3.3–)4.3–5.7(–5.9) µm, with a low content of carotenoid pigment (turning green in IKI)
Asci: (183–)184–222(–258) x (15.9–)17.1–20.6(–21.4) µm; cylindrical, narrowing toward the base, unitunicate, operculate, inamyloid, with a hemispherical apex, 8-spored
Ascospores: fusiform, (22.9–)23.2–26.3(–26.6) x (8.6–)9.5–10.8(–11.8) µm; Q = (2.1–)2.3–2.6(–2.9), hyaline, containing two large LBs 6–8 µm in diam. and usually also one to two smaller ones; biseriate or less often subbiseriate arranged in the ascus; cell wall at poles somewhat thickened; ornamentation consists of elongated and bent grooves, 4–5(–6) per surface view, which sometimes do not extend all the way from one pole to the other
Host: Aschisma carniolicum
Infectious structures: infects the stem, basal leaf cells, and rhizoids, appressoria 1-celled or with one septum, broadly ellipsoid, 12–25 µm long, 8–12 µm wide and 9–18 µm high
Habitat: disturbed soil, mainly in open and dry grassland
Distribution: Spain (Andalucía, Castilla y León, La Rioja)

References:
  • Ribes M., Martínez-Gil R., Eckstein J., Vega M., Janošík L. & Calzada A. 2024. Octospora sulcatispora sp. nov. (Pezizales) – a species of Octospora with an unexpected ascospore ornamentation. 16: 235–247. DOI
Images:
Octospora sulcatispora Octospora sulcatispora
3: Octospora sulcatispora, spores in water, holotype 4: Octospora sulcatispora, spores in water, holotype

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