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Nomenclature

Russula texensis Buyck, Adamcik & Lewis
Cryptog. Mycol. 29 (2): 122-126. 2008.

Original diagnosis

Russula texensis sp. nov.

Pileus 73 mm diam., haud zonatus, regularis, marginem versus laevis dein breviter striatus, pileipellis partim secernens, glaber, vinaceus, fere purpureus in centro,irregulariter pallidiore marginem versus. Stipes cylindratus, 56 × 14-16 mm, glaber, haud pruinosus, albus sed mox sursum fulvescens, intus spongiosus. Caro albida, intus mox brunnescens vel grisescens, griseoviridis ope FeSO4, mitis, odor ingratus. Lamellae friabiles, adnatae vel sublibrae, haud confertae, albidae ad cremeae, lamellulae nullae, acies integra, concolor. Sporae pallidae in cumulo.
Sporae breviter ellipsoideae, (6,4-) 6,9-7,3-7,8 (-8,3) × (5,3-) 5,6-6,2-6,6 (-6,7) µm, Q = (1,07-) 1,12-1,19-1,26 (-1,32), ornamentatione valde amyloidea, spinis moderate densis, 0,4-0,9 mm altis, locale connectis vel confluentibus ornatae. Basidia (34-) 39-43,9-49 (-57) × (10-) 10,5-11,3-12 (-13) µm, tetraspora, clavulata, macula suprahilaris amyloidea. Pleurocystidia haud numerosa (<500/mm2), 49-64,7-83 × 7-9,2-11,5 µm, clavata vel fusiformia, pedicellata, mucronata ad capitulate, tenuitunicata vel paulum medio incrassata, contentu fibrillosa SV insensibile repleta. Pileipellis omnino orthochromatica in azureo cresylico, hyphis intertextis paulum gelatinosis composite; suprapellis 40-50 µm crassa, pilis ascendentibus, attenuatis tenuitunicatis efformata; cellula terminale marginem versus (25,5-) 31,5-39,6-48 (-66) × (3,5-) 4-4,7-6 (-7) µm, centro minus crassa et (16-) 18-24,2-30 (-40) × 2,5-3,3-4 (5,5) µm, attenuata, apicale constricta vel moniliforme modo constricta, interdum diverticulata. Pileocystidia distincta abundantiaque in pilei superficie, unicellulata, 32-52,7-73 × 8-11,1-14 µm, fusiformia vel clavata, pedicellata, generaliter mucronata vel appendiculata, rara et longioria in subpelle, contentu fibrillosa SV insensibile repleta. Fibulae nullae.
Holotypus: USA: Texas. Newton Co., Bleakwood, D. Lewis' property, in mixed bottomlands with water oak, laurel oak, beech (Fagus grandifolia), loblolly pine and swamp chestnut, 24 July 2007, Buyck 07.070 (PC, holotypus).

Typification

Holotypus: Buyck 07.070 (PC)
North America: United States: Texas: Newton Co., Bleakwood, D. Lewis' property
In mixed bottomlands with water oak, laurel oak, beech, loblolly pine and swamp chestnut

Description

Photographs

Microscopy

SEM photos