Rhytismatales » Rhytismataceae » Lophodermium

Lophodermium herbarum

Lophodermium herbarum (Fr.) Fuckel
Facesoffungi number: FoF 05948.
Saprobic on dead stems and leaves. Sexual morph: Apothecia 0.5–1 × 0.3–0.6 mm, arising singly, sessile, ellipsoid, slightly erumpent. Receptacle palisade layer of asci and paraphyses. Disc flat to slightly concave. Excipulum 30–35 µm ( x = 33 µm, n = 10) in lower side walls, composed of thin-walled cells of textura angularis, cells in outer layer are dark brown to black and inner cells are light brown to hyaline. Hymenium hyaline. Paraphyses 1–2.5 µm wide ( x = 2.2 µm, n = 20), numerous, filiform, apices obtuse, slightly curved and attached together with gelatinized material, septate, smooth, guttulate. Asci 80–110 × 8–10 µm (x = 85.3 × 9.3 µm, n = 30), 8-spored, unitunicate, cylindric-clavate, conical and non-amyloid apices, short-stipitate base, arising from croziers. Ascospores 40–50 × 1–2 µm (x = 44.5 × 1.5 µm, n = 40), multi-seriate, fusoid, aseptate, hyaline, guttulate, acute tips. Asexual morph: Undetermined.
Material examined – Russia, Arkhangelsk region, Akhangelsk City, Maimaksansky City District, saprobic or weak parasitic on dead stems of Calamagrostis epigeios (L.) Roth (Poaceae), 2 August 2015, Gennady V. Okatov, AR-042 (MFLU 15-3182). Italy, Ravenna Province [RA], Lido di Dante, dead aerial stem of Ammophila arenaria (L.) Link (Poaceae), 9 February 2016, Erio Camporesi IT2829 (MFLU 16-0877).
GenBank accessions – MFLU 15-3182: LSU- MK591954, SSU- MK585011; MFLU 16-0877: LSU- MK592005, ITS- MK584985, SSU- MK585061 Notes – Our strains of Lophodermium from Russia and Italy grouped with L. herbarum-L. actinothyrium clade (Fig. 61). The ITS region of our collections is similar to that of L. actinothyrium (isolate losa139) (437/442-99% with no gaps) from Argentina, while the LSU region is similar to that of L. herbarum (voucher Lantz 439) (733/736 -99% with no gaps), L. nitidum (Lantz 435) (771/778-99% with 2 gaps) and L. culmigenum (Lantz 442) (768/778-99% with 2 gaps). LSU data of L. actinothyrium and ITS data of L. herbarum, L. culmigenum and L. nitidum are not available in GenBank to compare with our data. The morphological characters of our collection are in agreement with the description for L. herbarum provided by Tehon et al. (1935).

Morphology of Lophodermium herbarum (MFLU 15-3182) a Substrate. b Apothecia on wood. c Cross section of an apothecium. d, e Filiform paraphyses. f, g Fusoid ascospores. h–j Cylindric-clavate asci. Scale bars: c = 25 µm, d, e = 20 µm, f–g = 10 µm, h–j = 20 µm.

 

 

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