Jahnulales » Aliquandostipitaceae » Jahnula

Jahnula rostrata

Jahnula rostrata Raja & Shearer, Mycologia 98(2): 325 (2006)

Index Fungorum number: 501331


Saprobic on decaying wood submerged. Sexual morph: Ascomata 320–420 × 310–330 μm, superficial, solitary to scattered, subglobose or pyriform, brown to black, rough-walled, with ostiolate papilla. Neck 48–75 × 74–98 μm, composed of sub- globose cells diverging from the ostiole. Peridium 25–40 μm wide, two-layered, outer layer composed of large, dark brown, thick-walled cells of textura angularis, inner layer composed of compressed, hyaline, thin-walled cells of textura angularis. Pseudoparaphyses 2.5–3.5 μm wide, cellular, hypha-like, hyaline, septate, unbranched. Asci 135–200 × 21–32 μm ( = 160 × 28 μm, n = 15), 8-spored, bitunicate, fissitunicate, clavate, short pedicellate, with an ocular chamber. Ascospores 28–40 × 11–17 μm ( = 35 × 13.5 μm, n = 15), overlapping biseriate, ellipsoidal or broadly fusiform, with rounded or occasionally acute ends, upper cell slightly broader than lower cell, hyaline to brown when young, dark brown at maturity, 1-septate, constricted at the septum, with thick and dark band at septum when mature, rough-walled, with minute striated pattern, guttulate, with or without sheath. Asexual morph: Undetermined. (Descriptions from Dong et al. 2020)


Specimen examined: CHINA (Dong et al. 2020), USA (Raja and Shearer 2006; Raja et al. 2009)


Fig 1. Jahnula rostrata (MFLU 20-0435, new geographical record). a Appearance of black ascoma on host substrate. b Structure of ostiole. c Pseudoparaphyses. d Vertical section of ascoma. e Structure of peridium. f–i Ascospores. j–m Bitunicate asci. n Germinated ascospore. o, p Colony on PDA (left-front, right-reverse). Scale bars: b, e–n = 30 μm, c = 10 μm, d = 50 μm (Photo grabbed from Dong et al. 2020)



Dong W, Wang B, Hyde KD, et al (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575

Raja HA, Schmit JP, Shearer CA (2009) Latitudinal, habitat and substrate distribution patterns of freshwater ascomycetes in the Florida Peninsula. Biodivers Conserv 18:419–455

Raja HA, Shearer CA (2006) Jahnula species from North and Central America, including three new species. Mycologia 98, 319–332


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