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Page number:89 
Remarks (internal):Smith & Zeller (1966) reported that this species is very close to R. fuscorubens A.H. Smith. Both have similar chromatograms (Martín & Sánchez, 1996), but microscopic characters (peridium type, basidia and spores) separate them. The lageniform basidia of R. ochraceorubens are very similar to those observed in R. aurantiacus A.H. Smith and R. luteolus Fr. & Nordholm. 
Description type:Non-original description 
Description:Rhizopogon ochraceorubens A.H. Smith in Smith & Zeller, Mem. N.Y Bot. Gdn. 14: 124-125, 1966 (fig. 59).
Etymology: ochraceorubens, L, referring to the ochraceous, reddish to vinaceous-red pigments observed in the peridium.
Type: United States, Idaho, Valley Co., Payette National Forest, Twin Lakes Road, under mixed conifers, 20.7.1957, leg. A.H. Smith 59057 (E, Paratype); Idaho, Seven Devils Mountains, Heaven's Gate Ridge, under white bark pine & alpine fir, 2.8.1950, leg. A.H. Smith 59470 (UPS, Paratype).
Illustrations: Figs. 42, 43 and 44.
Macroscopic characters. Basidiocarps globose to subglobose (2.0-5.0 x 2.5-4.5 cm). Peridium white, then orange (174) to orange (172); in mature fruitbodies becoming red (106) with rubbing. Dry peridium purple black (706) with some violet (661) areas. Both, young and mature fruitbodies are completely covered by rhizomorphs which blacken when dry, becoming inconspicuous. Gleba cartilaginous when fresh, becoming bone-hard on drying; small locules (up to 0.30 x 0.45 mm), isodiametric when young to labyrinthiform at maturity; white at first, then chamois (250), then oleaginous (327). Odor fruity.
Chemical reactions. Peridium colour: (a) KOH: in young fresh fruitbodies no change; red (106) to violet (662) in mature specimens both fresh or dry; (b) FeSO4: no change or green (426).- Gleba colour: (a) KOH: no change; (b) FeSO4: no change.
Microscopic characters. Peridium (up to 450 µm high), simple (corsicus-type), formed of hyphae (3-4 µm diameter), hyaline to ochre-coloured, septate, thin-walled and unbranched. These hyphae are mixed with globose cells ( up to 25 x 30 µm) giving the peridium a pseudoparenchymatous aspect. In the inner part of young fruitbodies, patches of ochraceous pigments appear in the space between the hyphae and the cells. At maturity, numerous patches of ochraceous to vinaceous pigments are distributed along the whole peridium. Trama plates are composed of laxly interwoven hyphae (up to 75 µm blood); these hyphae (3-5 µm diameter) are highly gelatinous-refractive, septate, thick-walled and branched. Subhymenium thin (up to 20 µm high), subcellular (cells up to 15 x 7 µm) and gelatinous-refractive in appearance. Brachybasidioles (11-20 x 6-8 µm), clavate, thick-walled. Basidia cylindrical (30-39 x 4-4.5 µm) to lageniform with a ventricose base (7-20 x 5-7) and a long beak (22-55 x 2.5-3 µm) developing a variable number of sterigmata (2,4, 6 or 8) in apical position (Fig. 42). Spores 5-6.2 x 2.3-3.5 µm, oblong-ellipsoid with a subtruncate base, thick-walled, biguttulate (Fig. 43).
Chemical reactions. Peridium. (a) KOH: revives the pigment colours; (b) FeSO4: no change; (c) Melzer: no change.
Probable mycorrhizal hosts. All collections were found in coniferous forest. In Europe under Pinus sylvestris L. and Pinus nigra Arnold; samples from the United States were collected close to Pinus taeda L.

 
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