K. Bergelin, 8 Oct. 2011, LD 1617064. (Berlgin 2012, Svensk Mykologisk Tidskrift 33: 2–8) Gloioxanthomyces nitidus (Berk. & M.A. Curtis) Lodge, Vizzini, Ercole & Boertm., comb. nov., MycoBank MB804075 Type: USA, South Carolina, on earth in damp swamp, M.A. Curtis no. 2893, coll. H.W. Ravanel, Esq., ex herb. Berkeley 1605, K(M) 181764. Basionym: Hygrophorus nitidus Berk. & M.A. Curtis, Ann. Mag. nat. Hist., Ser. 2, 12: 424 (1853), ≡ Hygrocybe nitida (Berk. & M.A. Curtis) Murrill [as ‘Hydrocybe’], N. Amer. Fl. (New York) 9(6): 378 (1916), [≡ Hygrocybe nitida (Berk. & M.A. Curtis) GS-1101 concentration Malloch (2010), superfluous], ≡ Gliophorus nitidus (Berk. & M.A. Curtis) Kovalenko, Mikol. Fitopatol.

22(3): 209 (1988)]. [Not “Hygrophorus nitidus Fr.” (1863) ≡ Hygrophorus friesii Sacc. (1887)]. Phylogenetic support As only ITS sequences are available for G. vitellinus and G. nitidus, Gloioxanthomyces is included only in our ITS analysis. The clade representing Gloioxanthomyces has 97 % MLBS support in our ITS analysis by Ercole (Online Resource 3). Both Ercole’s and Zhang’s (in Boertmann 2012) ITS phylogenies place

Gloioxanthomyces as sister to Chromosera citrinopallida (54 % MLBS and significant BS, respectively). In ITS analyses by Dentinger et al. (unpublished data), G. vitellinus and G. nitidus appear in clade with 99 % and 100 % MLBS support (entire Hygrophoraceae, and tribe Chromosereae, respectively) that is sister to Chromosera (63 % MLBS). Species included Type: Gloioxanthomyces vitellinus is European, while its sister species, G. nitidus is known from continental North America and Newfoundland (Boertmann 2012). Comments Ferrostatin-1 order however Gloioxanthomyces falls between Gliophorus sect. Glutinosae and Chromosera based on morphology (Table 3) and ITS sequence divergences. Gloioxanthomyces sequences diverge more from Gliophorus sect. Glutinosae (30 %) than from Chromosera (17 % divergent), which is concordant with placement of Gloioxanthomyces as sister to Chromosera in phylogenetic analyses by Ercole (Online Resource 3) and Zhang (in Boertmann 2012). Those results are concordant with the ITS analyses by Dentinger et al. (unpublished). Morphologically,

G. vitellinus and G. nitidus share with Gliophorus sect. Glutinosae an indented pileus, gelatinized lamellar edge, subregular lamellar trama and presence of cheilocystidia, but they differ from sect. Glutinosae in having modest rather than toruloid clamps in the hymenium, absence of a gelatinized subhymenium, having cheilocystidia that are cylindric or clavate rather than undulating and forked, and mean ratio of basidia to basidiospore lengths of 4.3–5.5 rather than 5–7 (Fig. 14). Gloioxanthomyces vitellinus and G. nitidus share with Chromosera an indented pileus, yellow pigments, absence of toruloid clamp connections in the hymenium, and mean ratio of basidia to basidiospore lengths of 3.5–5.5, but they differ in having a gelatinized lamellar edge, and presence of cheilocystidia.