Leptographium vescum (R.W. Davidson) M.L. Yin, Z.W. de Beer & M.J. Wingf.

Yin, Mingliang, Wingfield, Michael J., Zhou, Xudong, Linnakoski, Riikka & Beer, Z. Wilhelm de, 2019, Taxonomy and phylogeny of the Leptographium olivaceum complex (Ophiostomatales, Ascomycota), including descriptions of six new species from China and Europe, MycoKeys 60, pp. 93-123 : 93

Leptographium vescum (R.W. Davidson) M.L. Yin, Z.W. de Beer & M.J. Wingf. comb. nov.

≡ Ceratocystis vesca R.W. Davidson, Mycologia 50: 666. (1958) (Basionym)

≡ Ophiostoma vescum (R.W. Davidson) Hausner, J. Reid & Klassen. Can. J. Bot. 71: 1264. (1993)

≡ Grosmannia vesca (R.W. Davidson) Zipfel, Z.W. de Beer & M.J. Wingf., Zipfel et al., Stud. Mycol. 55: 92. (2006)

Type.

USA, Colorado, Fort Collins, from Ips pilifrons and Dendroctonus engelmanni in Picea engelmannii , Jan. 31, 1956, F.F. Lombard & R.W. Davidson, (holotype BPI 595662 = FP 70807, ex-holotype cultures: ATCC 12968 = CBS 800.73 = CMW 34186).

Descriptions.

Davidson (1958, p. 666); De Hoog and Scheffer (1984, p. 295, fig. 2); Samuels (1993, p. 16, fig. 1 C–F).

Host tree.

Picea engelmannii .

Insect vectors.

Ips pilifrons , Dendroctonus engelmanni .

Distribution.

USA.

Notes.

The perithecia of L. vescum are smaller than in related species and ascospores are different in shape and size. This species was treated as a synonym of L. olivaceum by various authors ( Griffin 1968, Olchowecki and Reid 1974, Upadhyay 1981). However, the sequences produced by Hausner et al. (1993, 2000), confirmed by our results, showed that the two species are distinct.