Leptographium olivaceum (Math.- Kaeaerik ) 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 olivaceum (Math.- Kaeaerik) M.L. Yin, Z.W. de Beer & M.J. Wingf. comb. nov.

≡ Ophiostoma olivaceum Math.- Käärik, Svensk. Bot. Tidskr. 45: 212 (1951). (Basionym)

≡ Ceratocystis olivacea (Math.- Käärik) J. Hunt, Lloydia 19: 29 (1956).

≡ Grosmannia olivacea (Math.- Käärik) Zipfel, Z.W. de Beer & M.J. Wingf., Zipfel et al., Stud. Mycol. 55: 91 (2006).

Type.

SWEDEN, Hällnäs, Västerbotten, from the galleries of Acanthocinus aedilis in pine wood, A. Mathiesen-Käärik, lectotype designated here, represented by line drawings (fig. 2 a–g, p. 213) from Mathiesen-Käärik (1951), MBT 379459; from dead wood of Pinus sylvestris , Jan 1949, A. Mathiesen-Käärik, (ex-type cultures: CMW 31059 = CBS 138.51, MBT 2063).

Descriptions.

Mathiesen-Käärik (1950, p. 298); Mathiesen-Käärik (1951, pp 212-215, fig. 2); Hunt (1956, pp 29-30); Griffin (1968, pp 707-708, figs 49-52, 82); Olchowecki and Reid (1974, pp 1699-1700, Pl. XIII fig. 262); Upadhyay (1981, pp 52-54, figs 116-121); Mouton et al. (1993, pp 376-377, figs 19-22).

Host trees.

Betula papyrifera , Picea abies , Picea mariana , Pinus sylvestris .

Insect vectors.

Acanthocinus aedilis , Dendroctonus rufipennis , Ips typographus , Polygraphus rufipennis .

Distributions.

Canada, Finland, Russia, Sweden, USA.

Notes.

This species was first described invalidly (no Latin diagnosis) from Pinus sylvestris infested by a longhorn beetle Acanthocinus aedilis in Sweden ( Mathiesen-Käärik 1950). Mathiesen-Käärik (1951) then validated the name with a more detailed description accompanied by a Latin diagnosis. In the original descriptions of L. olivaceum by Mathiesen-Käärik (1950, 1951), the host tree, beetle and location of the collection was noted, but no mention was made of a specimen. The herbarium specimens of Mathiesen-Käärik were initially curated in the herbarium of the Statens Skogsforsknings institut, Experimentalfältet, Sweden. The collection was later incorporated into the herbarium of the Museum of Evolution, Uppsala. Only one herbarium specimen (UPS:BOT:F-130986) of L. olivaceum , collected from the same host, beetle and location by T. Hedquist, is available from that collection. However, an isolate of L. olivaceum (No. 297-49 = CBS 138.51), collected in 1949, also from the original host and location, was deposited in the CBS by Mathiesen-Käärik in 1951. Although we were not able to confirm that this isolate was from the original collection, it was treated as the ex-type culture of the species in previous studies ( Duong et al. 2012, Linnakoski et al. 2012, De Beer and Wingfield 2013). In view of the absence of concrete evidence that this isolate represents the original material, we have designated the line drawings from the protologue ( Mathiesen-Käärik 1951) as lectotype.

More recently, it was reported from Picea abies and Pinus sylvestris infested by Ips typographus and Dryocoetes autographus in Finland and Russia, in a study where the identities were confirmed using DNA sequence analyses ( Linnakoski et al. 2012). Griffin (1968) reduced L. vescum to synonymy with L. olivaceum , but data from the present study confirmed that these two species are phylogenetically distinct.

Additional material examined.

FINLAND, Jouhteninen, from Ips typographus in Picea abies , July 2005, Z.W. de Beer, (cultures: CMW 23348 = CBS 128836, CMW 23350 = CBS 128837). RUSSIA, Uuksujärvi, from I. typographus in Pinus sylvestris , Oct 2007, R. Linnakoski, (culture CMW 28090). SWEDEN, Oct 1954, A. Mathiesen-Käärik, (cultures: CMW 31060 = CBS 152.54).