Xanthomendoza, S.Y.Kondr. & Kärnefelt, 1997

Vondrák, Jan, Frolov, Ivan, Davydov, Evgeny A., Yakovchenko, Lidia, Malíček, Jiří, Svoboda, Stanislav & Kubásek, Jiří, 2019, The lichen family Teloschistaceae in the Altai-Sayan region (Central Asia), Phytotaxa 396 (1), pp. 448-450 : 448-450

Xanthomendoza (including Golubkovia ; see Arup et al. 2013 for other included genera)

Three species recorded in the region. Two of them ( X. fulva , X. ulophyllodes ) belong to the Xanthoria ulophyllodes group (sensu Søchting et al. 2002), having tiny, thin foliose thalli with upper and lower cortex and indistinct medulla; both species produce vegetative diaspores (soredia, blastidia); apothecia are uncommon. The third species, X. trachyphylla , placed in the monotypic genus Golubkovia sensu Kondratyuk (2014b) , is characterised by a thick crust with long marginal lobes and with thick upper cortex and medulla; lower cortex is absent; vegetative diaspores are absent; apothecia are present on mature thalli. Literature: Arup et al. (2013), Lindblom (2004), Lindblom & Søchting (2008), Søchting et al. (2002).

Xanthomendoza fulva : 3 localities at altitudes 250–430 m in humid non-alpine nabitats. Substrate: bark of Populus tremula and Sorbus sibirica .

Xanthomendoza trachyphylla (= Caloplaca hedinii ): 3 localities at altitudes 2050–2900 m in arid alpine habitats. Substrate: siliceous rocks (then thalli without pruina; Fig. 5E ) or calcareous rocks (thalli with pruina in older parts; Fig. 5F ). Type of Calpolaca hedinii (L 2652 in S) described by Magnusson (1940) is from Central Asia and represents typical Xanthomendoza trachyphylla (synonymisation already made by Khodosovtsev et al. 2004).

Xanthomendoza ulophyllodes : 26 localities at altitudes 300–1730 m, in all ecological categories, but rare in alpine habitats. Substrate: variable, (1) calcareous or siliceous rocks, often on schist and sandstone, (2) bark of e.g. Larix , Pinus , Populus , Salix , (3) twigs of shrubs, e.g. Caragana and (4) over epigeic mosses. Similar species, X. fallax (mainly epilithic) and X. huculica (mainly epiphytic) were not recorded. ITS sequences of epilithic, corticolous and muscicolous specimens from Altai grouped with X. ulophyllodes .

Figures

FIGURE 5. Athallia (A), Caloplaca sensu stricto (B), Flavoplaca (C), Squamulea (D) and Xanthomendoza (E,F).A, Athallia sp. (Vondrák 18073); B, holotype of Caloplaca fluviatilis; C, Flavoplaca oasis (Vondrák 18222) with indistinct marginal thallus lobes (character typical for Mediterranean-European F.polycarpa); D, Squamulea sp. (Vondrák 18682) resembling small morphotypes of Squamulea irrubescens; E, Xanthomendoza trachyphylla, a common morphotype (Vondrák 18044); F, X. trachyphylla with pruinose thallus on limestone (Vondrák 18028). All bars, 1 mm.