Cantharellus tabernensis Feib. & Cibula, Mycologia 88: 299 (1996)

Montoya, Leticia, Herrera, Mariana, Bandala, Victor M. & Ramos, Antero, 2021, Two new species and a new record of yellow Cantharellus from tropical Quercus forests in eastern Mexico with the proposal of a new name for the replacement of Craterellus confluens, MycoKeys 80, pp. 91-114 : 91

Cantharellus tabernensis Feib. & Cibula, Mycologia 88: 299 (1996) Figs 2e, f , 5

Description.

Pileus 10-30 mm diam, hemispheric to convex, becoming broadly conical to plane convex and faintly depressed in the disc, margin incurved when young, somewhat inflexed to straight with age or somewhat reflexed, not striate, not or faintly undulate or crenulate; hygrophanous, with dull appearance, some with greyish appressed fibrils at center and smooth at the margin when young, smooth to glabrescent with age; light yellow (2.5Y 8/6-8/8, 4A5). Hymenophore decurrent or shortly decurrent, with gills up to 3 mm deep, subdistant to more frequently distant, continuous, or forked at different levels, moderately thick; margin entire, at times with irregular anastomosis among folds, with short lamellulae-like folds; yellow to egg yellow (10YR 8/8) brighter than the pileus. Stipe (15-) 19-40 × 2-6 mm, central or at times slightly eccentric, equal, occasionally somewhat applanate, at times slightly fused or broader at base, solid to hollow, often furrowed especially below, hygrophanous, surface smooth, concolorous with the pileus; mycelium whitish to pale yellowish. Context 1-3 mm thick cream color to yellowish, odor mild, agreeable; taste mild, agreeable.

Basidiospores 6.5-8.5 × 4.5-5 µm [X - = 7.32-7.34 × 4.8-4.9 µm, X - = 1.49-1.52, (n = 2)], ellipsoid, smooth, thin-walled, hyaline, inamyloid, with granular contents or refractive droplets. Basidia (53-) 56-87 (-99) × 6-10 µm, narrowly clavate to subcylindrical, with 2-4 sterigmata, thin-walled, hyaline; subhymenium composed of cylindrical hyphae 3-5 µm diam. Cystidia absent. Pileipellis a cutis composed of hyphae 5-8 µm diam, intermingled in a compact arrangement, cylindrical, hyaline, inamyloid, with terminal hyphae cylindrical to somewhat subclavate, 62-75 × 6-10 µm, slightly thick-walled (<1 µm thick), smooth, hyaline, inamyloid, usually abundant. Pileus trama composed of cylindrical hyphae, 3-8 µm diam, slightly thick-walled (<1 µm thick), hyaline. Hymenophoral trama composed of hyphae 3-6 µm diam, thin-walled. Clamp connections present in all tissues.

Habitat.

Solitary to gregarious, rare in the study area, on soil, in tropical oak forest, under Quercus oleoides and Q. sapotifolia , fruiting in June at the coastal plain of central Veracruz State, east coast of Mexico.

Specimens examined.

Mexico. Veracruz, Municipality of Zentla, Road Puentecilla-La Piña, 837 m a.s.l., 11 Jun 2015, Herrera 120, 121; 10 Sep 2015, Herrera 131 (all at XAL) .

Remarks.

In our phylogeny Mexican sequences of specimens Herrera 120 and 121 clustered (Fig. 1 ) with high values of Bootstrap and Bayesian posterior probabilities (96/0.99) with a sequence of the type specimen of Cantharellus tabernensis from U.S.A., produced by Buyck et al. (2014). The morphological description provided above includes both mentioned specimens, and in fact, in the most relevant characters, those specimens agree with the species. It should be mentioned, however, that the following features recorded in the description provided by Feibelman et al. (1996) were not observed in the Mexican material: pileus mat felted overall, often umbilicate, sometimes perforated, basidia 4-5-6 -spored and dark plasmatic pigment confined to clavate terminal cells of the surface hyphae at disc.

The record presented here of C. tabernensis , in its turn provides additional information on the species distribution. It is known from the mixed pine and hardwood forests, usually near Pinus elliotii Engelm., at the Gulf coastal plain in Texas, Mississippi, and Louisiana states in USA ( Feibelman et al. 1996), and now C. tabernensis is known also in the tropical Quercus forest from Veracruz, in the coastal plain of Veracruz state in the Gulf of Mexico.

Figures

Figure 1. Phylogenetic relationships within Cantharellus species inferred from the combined nLSU (large subunit of the ribosome) and tef- 1 α (transcription elongation factor 1 - alpha) sequences, by maximum likelihood method and Bayesian inference. The new species are indicated in bold letters. Bootstrap scores (only values ≥ 70) and Bayesian Posterior Probabilities (only values ≥ 0.90) are indicated above branches.

Figure 2. Basidiomes of Cantharellus species a, b C. veraecrucis (a Bandala 4505, holotype b Herrera 142) c, d C. parvoflavus (c Montoya 5423, holotype d Herrera 229) e, f C. tabernensis (e Herrera 120 f Herrera 131). Scale bars: 10 mm.

Figure 5. Cantharellus tabernensis (Herrera 131) a basidiospores b basidia c Terminal elements of the pileipellis d longitudinal section of pileipellis. Scale bars: 5 μm (a); 10 μm (b, c); 25 μm (d).