Firmae micromorphologically resembles species in subsect. Squamulosae, where Singer (1986) placed it, and the H. miniata species complex, which Singer and others also placed in subsect. Squamulosae. Despite the micromorphological similarities, phylogenetic analyses by us and by Dentinger et al. (unpublished data) suggest a strong relationship between sect. Firmae and the H. miniata complex, but a weak or absent relationship between that combined clade and subsect. Squamulosae. Additional analyses

including more species and gene regions will be needed to resolve relationships among these clades. In keeping with making minimal changes TSA HDAC in vivo in classification unless strongly justified by phylogenetic analyses, we have retained sect. Firmae and left the H. miniata clade unplaced. Fig. 10 Hygrocybe (subg. Pseudohygrocybe) sect. Firmae. Hygrocybe firma (type): a.

pileipellis; b. hymenium showing macro- and microbasidia; c. microspores; d. macrospores. Scale bar = 20 μm Species unplaced subgen. Pseudohygrocybe. Hygrocybe miniata, H. miniata f. longipes, and H. phaeococcinea appear in a well supported clade that is sister to sect. Firmae in our ITS analysis of Hygrocybe s.s. Similarly, the H. miniata species complex falls in a strongly supported (85 % MLBS) sister clade to sect. Firmae (H. firma s.s. and H. martinicensis) in our LSU analysis of tribe Hygrocybeae (Online Resource 7). Hygrocybe miniata shares with subsect. Squamulosae large diameter pileipellis hyphae (5–18 μm), presence of subglobose elements in the pileus hypoderm and small mean spore Q (1.3–1.6). Consequently, Singer [(1949) 1951), Bon (1990) and Boertmann click here 2-hydroxyphytanoyl-CoA lyase (1995, 2010)] all treated H. miniata in subsect. Squamulosae. The H. miniata – sect. Firmae clade (100 % MLBS) appears as sister to subsect. Squamulosae (97 % MLBS) with low support (39 % MLBS) in our LSU analysis of tribe Hygrocybeae while the H. miniata complex and sect. Squamulosae appeared in sister clades with strong support (77 % MLBS) in the ITS analysis by Babos et al. (2011). In our Supermatrix analysis, H. miniata f.

longipes is included in the basal clade of subgen. Hygrocybe with H. helobia, but without significant bootstrap support (32 % ML); the short lamellar trama hyphae in H. miniata argues against that placement. Inclusion of H. firma, the type of sect. Firmae, as sister to the H. miniata clade, and these together as sister to sect. Coccineae subsect. Squamulosae is problematical on several levels. Species in sect. Firmae have dimorphic spores and basidia, but otherwise they have all the diagnostic characters of subsect. Squamulosae and species in the H. miniata clade. Singer (1986), Horak (1990) and Young (2005) treated Hygrocybe with dimorphic basidia as members of subg. learn more Pseudohygrocybe, and the phylogenetic placement and micromorphology of the basidiomes of H. firma are concordant with that placement.