Anguillosporella vermiformis
Anguillosporella vermiformis (Davis) U. Braun, Monogr. Cercosporella, Ramularia Allied Genera (Phytopath. Hyphom.) 1: 234 (1995) Fig. 1
= Cylindrosporium vermiforme Davis, Trans. Wis. Acad. Sci. Arts Lett. 18(1): 104 (1915)
Index Fungorum number: IF 121640; Facesoffungi number: FoF 06210
Parasitic on the surface of living leaves of Alnus incana. Sexual morph: Undetermined. Asexual morph: Thyriothecia 0.5– 2 mm high × 5– 15 mm diam. (x̅ = 0.5 × 13 µm, n = 10), forming amphigenous, subcircular to irregular immarginate, flat dark brown spots, sparsely scattered or not entirely distributed on surface of leaves. Conidiophores 18–26 µm high, 3–4 µm wide (x̅ = 22 × 3 µm, n = 10), straight or slightly curved, brown, vermiform, curved, sigmoid or flexuose, pluriseptate, thick-walled. Conidiogenous cells holoblastic, brown. Conidia 6–10 µm × 4–6 µm (x̅ = 6 × 5 µm, n = 10) solitary, conglobate, hyaline when immature, brown when mature, 1-septate, strongly constricted at the septum, thick-walled.
Material examined – USA, Wisconsin, Devils Lake, Sauk Co. on leaves of Alnusincana sp (Betulaceae), 7 August 1913, J.J. Davis (F4817, holotype).
Economic significance – The genus Anguillosporella is a plant pathogenic genus, causing large, confluent, brown leaf spots and disease on hosts especially on hazelnut (Corylus avellana) (Pscheidt 2012).
Figure 1 – Anguillosporella vermiformis (F4817, holotype). a–d Herbarium specimen and habit on leaf. e Squash mount of a conidioma. f Section of a conidioma g–j Conidiophore and conidiogenous cells. k–n Conidia. Scale bars: c = 1 mm, d = 500 μm, e, f = 50 μm, g–j = 10 μm, k–n = 5 μm.
References
Pscheidt JW, Ocamb CM. 2019 – Pacific Northwest Plant Disease Management Handbook [online]. Corvallis, OR: Oregon State University. Available at: http://pnwhandbooks.org/plantdisease (accessed 7 April 2019).
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