Dothideomycetes families incertae sedis » Leptopeltidaceae » Ronnigeria

Ronnigeria arctica

Ronnigeria arctica (Oudem.) Petr., Sydowia 1(4–6): 310 (1947).

≡ Microthyrium arcticum Oudem., Ned. kruidk. Archf, 2 sér. 3: 160 (1886).

Index Fungorum number: IF 290565; Facesoffungi number: FoF 12094, Fig. 1

Description:

Saprobic on leaves. Sexual morph: Ascomata 100–115 μm diam., 25–55 μm high, superficial, solitary to gregarious, scattered or in group, globose to subglobose, subcuticular, very thin, strongly depressed rounded or broadly ellipsoidal, almost shield-shaped, initially closed, at maturity raised by a short, simple somewhat lobed rupture opening by a hyaline pseudoparenchymatic internal tissue. Peridium 5.5–9.5 μm, composed of reddish-brown cells of textura angularis. Hamathecium 1.7–2.0 μm, of wide, scarce, hyaline, branched, septate, cellular pseudoparaphyses. Asci 35−40 × 9−10 µm (x̄ = 38.6 × 9.5 µm, n = 10), 8-spored, bitunicate, fissitunicate, oblong-clavate, slightly curved, sessile or with knob-like pedicel, thickened at the apex with a small ocular chamber. Ascospores 7.5−10.3 × 3−5 µm (x̄ = 9.8 × 4.2 µm, n = 10), biseriate, fusoid-ellipsoid, rounded and subacute at the ends, hyaline, one-celled, with granular appearance. Asexual morph: Unknown.

Material examined: Norway, Sor-Trondelag, Opdal, Knutsho, W sluttningen, on Matrix Potentilla (Rosaceae), 14 July 1965, O. Eriksson (UME 34712).

Fig. 1 Ronnigeria arctica (UME 34712). a–d Herbarium material and appearance of ascomata on host substrate. e Section through ascoma. f Peridium. g Cellular pseudoparaphyses. h–l Asci. m–q Ascospores. Scale bars: c = 5000 μm, d = 500 μm, e = 50 μm, f, g = 10 μm, h–l, m–q = 20 μm.

Importance and distribution

Ronnigeria comprises only one species known on Potentilla sp. (Rosaceae) and Sibbaldia procumbens (Rosaceae). Ronnigeria is reported from Europe (Norway and Sweden).

 

Reference

Petrak F. 1947 – Ronnigeria, n. gen., eine neue Gattung der Leptopeltineen. Sydowia 1(4–6), 309–312.

 

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