Venturiales » Venturiaceae » Dimerosporiopsis

Dimerosporiopsis engleriana

Dimerosporiopsis engleriana (Henn.) Henn., Hedwigia 40(Beibl.): (173) (1901).

≡ Dimerosporium englerianum Henn., Bot. Jb. 17: 31 (1893).

           Index Fungorum number: IF 142771; Facesoffungi number: FoF 12058, Fig. 1

Description:

Saprobic on wood. Sexual morph: Ascomata 250–275 μm diam., 195–275 μm high, clustered, gregarious, erumpent, subglobose to globose, medium-sized, dark brown to black, ostiolate. Ostiole apex somewhat papillate to depressed, coriaceous. Peridium 35–45 μm comprising few layers of dark brown cells of textura angularis. Hamathecium 2.0–3.0 μm of dense, hyaline, broad, pseudoparaphyses embedded in a gelatinous matrix. Asci 95–115 × 12–13 μm (x̄ = 98.2 × 12.8 µm, n = 20), 8-spored, bitunicate, fissitunicate, clavate, straight to curved, with a short broad pedicel, rounded at apex with an ocular chamber. Ascospores 15–17 × 5–7 μm (x̄ = 16.2 × 6.2 µm, n = 20), bi-seriate or obliquely uni-seriate, partially overlapping, ellipsoid,uniseptate, slightly constricted at the septum, rounded at the ends, smooth-walled, thin-walled without a gelatinous sheath, brown to chestnut or pale brown. Asexual morph: Unknown.

Material examined: Congo, on dead stem, 1 July 1948, Hendrickx FL (BR5020038874744).

Fig. 1 Dimerosporiopsis engleriana (BR5020038874744). a Herbarium material. b, c Appearance of ascomata on host surface. d Setae. e Section through ascomata. f Peridium. g Cellular pseudoparaphyses. h–j Asci. k–o Ascospores. Scale bars: b = 1000 μm, c = 500 μm, d, f = 20 μm, e = 100 μm, g, k–o = 10 μm, h–j = 50 μm.

Importance and distribution

Dimerosporiopsis comprises two species. Dimerosporiopsis engleriana is known on flowers of Ericinella mannii (Ericaceae) in Africa (Tanzania). Dimerosporiopsis macrospora is reported on male cones of Pinus monticola (Pinaceae) in The United States (Idaho).

 

References

Crous PW, Schumacher RK, Wood AR, Groenewald JZ. 2019 – The Genera of Fungi – G5: Arthrinium, Ceratosphaeria, Dimerosporiopsis, Hormodochis, Lecanostictopsis, Lembosina, Neomelanconium, Phragmotrichum, Pseudomelanconium, Rutola, and Trullula. FUSE 5, 77–98.

Hennings P. 1901 – Organ Kryptogamenkunde and Phytopathologie nebst Repertorium fur Literatur. Hedwigia 40, 173.

Sivanesan A. 1974 – A new species of Protoventuria and some further combinations of Protoventuria for Antennularia species. Transactions of the British Mycological Society 63, 590–594.

 

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