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Hormonema Viticola Fungal Planet Description Sheets 229 228 Persoonia – Volume 34, 2015 Hormonema viticola Fungal Planet description sheets 229 Fungal Planet 353 – 10 June 2015 Hormonema viticola F. Laich & Stchigel, sp. nov. Etymology. Named after the host (Vitis vinifera; vine), from which the from Aureobasidium spp., a morphologically closely related fungus was isolated. ‘black yeast’ (De Hoog et al. 1999, Yurlova et al. 1999). ITS- Classification — Dothioraceae, Dothideales, Dothideomy­ based phylogeny also placed H. dematioides in synonymy cetes. with Sydowia polyspora (Yurlova et al. 1999, Hambleton et al. 2003). The ITS-based phylogenetic tree confirms that the isolate Mycelium composed of hyaline, branched, strongly septate L9D-17 represents a new species for the genus Hormonema. hyphae, smooth- and thin-walled, swollen at septa, 3.5–6 μm Hormonema viticola can easily be distinguished from the other diam, becoming monilliform and dark brown with age due to species of the genus and from the asexual morphs of Dothiora the production of solitary to catenate chlamydospores of up to spp., Pringsheimia spp. and Guignardia miribelii because it 20 μm diam, with some segments remaining hyaline or nearly produces larger hyaline conidia (De Hoog & Hermanides-Nijhof so. Conidiogenous cells integrated on hyphae, intercalary or 1977, Voronin 1986, Middlehoven & De Hoog 1997, Yurlova et terminal, inconspicuously to conspicuously denticulate. Conidia al. 1999, Bills et al. 2004). Aureobasidium pullulans var. melano­ holoblastic, at first synchronously produced in small groups on genum (De Hoog & Hermanides-Nijhof 1977, Zalar et al. 2008) lateral protrusions of the hyphae on short (1 μm long) conic- is morphologically the closest species, but H. viticola produces truncate denticles, and later percurrently produced along the endoconidia (not seen in A. pullulans var. melanogenum) and hyphae and on side branches from larger denticles (1.0–1.5 secondary conidia in short chains (single conidia produced at μm long). Conidia hyaline at first, mostly aseptate, sometimes one or both ends in A. pullulans var. melanogenum). septate at the middle and slightly constricted at septa, smooth- 89 Kabatina juniperi CBS 239.66 and thin-walled, variable in shape but mostly ellipsoidal, clavate 97 Kabatina juniperi CBS 466.66 at both ends when septate, 5–17 × 4–10 μm, becoming dark Kabatina thujae CBS 238.66 brown and thick-walled with the age, smooth-walled to granu- Dothidea insculpta CBS 189.58 Dothidea hippophaeos CBS 186.58 lose due to deposition of a dark pigment on the cell surface, 98 12–20 × 4–12 μm. Microcyclic conidia produced by budding 70 Dothidea muelleri CBS 191.58 of both hyaline and pigmented conidia, produced singly or in Dothiora rhamni-alpinae CBS 745.71 Hormonema prunorum CBS 933.72 chains of up to 4, at one or both ends but sometimes later- 97 ally, being smaller than the primary ones. Endoconidia also Hormonema prunorum CBS 933.72 Dothiora cannabinae CBS 737.71 present in hyaline segments of hyphae, ellipsoidal, hyaline, Dothiora europaea CBS 739.71 4–6 × 3–4 μm. Sydowia japonica FFPRI 411088 Culture characteristics — Colonies on 2 % MEA and on PDA Hormonema carpetanum IMI 392072 attaining 21–25 mm diam in 7 d at 25 °C, flattened to slightly Coniozyma leucospermi CBS 111289 cerebriform and slimy due to the production of abundant conidia Endoconidioma populi UAMH 10297 and of exopolysaccharides, light yellow (M. 4A4) or olive brown Atramixtia arboricola UAMH 11211 (M. 4E8 to 4F5) (Kornerup & Wanscher 1978), with white mar- Sydowia polyspora CBS 248.93 Sydowia polyspora CBS 544.95 gins; reverse concolorous with the surface. Colonies on PCA 99 Sydowia polyspora CBS 128.64 attaining 21–24 mm diam in 7 d at 25 °C, flat, margins fimbriate, 93 with olive (M. 3F4) radiations on a whitish background; reverse Hormonema macrosporum CBS 536.94 Scleroconidioma sphagnicola UAMH 9731 of the same colour as the surface. The fungus grows slowly at Rhizosphaera macrospora ATCC 4636 89 10 °C and at 30 °C, and does not grow at 5 °C and at 35 °C. 91 Rhizosphaera oudemansii ATCC 46390 Maximum tolerant salt concentration, 10 % NaCl. Hormonema viticola L9D-17 Pringsheimia smilacis CBS 873.71 Typus. SPAIN, Canary Islands, Lanzarote, La Geria (28.9764; -13.6917), from fruit (grapes) of Vitis vinifera cv. Malvasia, Aug. 2009, coll. F. Laich, isol. Selenophoma australiensis CBS 124776 S.S. González­González & F. Laich (holotype CBS H-22115, cultures ex-type Phaeosclera dematioides CBS 157.81 FMR 13040 = L9D-17; ITS sequence GenBank KP641179, LSU sequence Selenophoma mahoniae CBS 388.92 KF201298, MycoBank MB811828). Aureobasidium melanogenum CBS 105.22 Aureobasidium namibiae CBS 147.97 Notes — The genus Hormonema was erected in 1927 to Aureobasidium pullulans CBS 701.76 introduce the new species Hormonema dematioides and Hor­ Kabatiella lini CBS 125.21 monema pallida (nom. inval.). Since then, another five species Kabatiella microsticta CBS 342.66 have been accepted in the genus: H. carpetanum, H. macro­ Aureobasidium pullulans CBS 584.75 sporum, H. merioides, H. prunorum and H. schizolunatum. Aureobasidium pullulans CBS 100524 Differences in the conidiogenesis, in the physiology and the Pringsheimia euphorbiae CBS 747.71 ITS1 and ITS2 sequences lead to separate Hormonema spp. 0.2 Maximum likelihood tree (MEGA v.6) was obtained from the ITS sequences of our isolate and other sequences retrieved from the GenBank nucleotide database (TreeBASE Submission ID. Colour illustrations. La Geria, Lanzarote, Canary Islands, Spain. Young 17323). In the tree, branch lengths are proportional to distance. conidiogenous structures and conidia, old conidiogenous structures showing Bootstrap support values ≥ 70 % are indicated on the nodes. dark-coloured thallic and blastic conidia. Scale bar = 5 µm. The new species proposed in this study is indicated in bold face. Alberto M. Stchigel, Medical School and IISPV, Universitat Rovira i Virgili, Reus, Spain; e-mail: [email protected] Federico Laich, Instituto Canario de Investigaciones Agrarias, Ctra. El Boquerón s/n, 38270, Valle de Guerra, Tenerife, Spain; e-mail: [email protected] © 2015 Naturalis Biodiversity Center & Centraalbureau voor Schimmelcultures.
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