taxonID	type	description	language	source
03B55D1DE25F6D51FA97FD6DD278FD3A.taxon	diagnosis	Diagnosis: — Differs from Russula subrubescens by small-sized basidiospores and large-sized cystidia.	en	Ji, Rui-Qing, Xie, Meng-Le, Zhou, Ji-Jiang, Meng, Li-Peng, Li, Yu, Zhang, Zhong-Hui, Li, Guo-Jie (2022): Russula rubiginosus sp. nov. in Russula subsect. Maculatinae from Heilongjiang Province, Northeast China. Phytotaxa 575 (2): 140-148, DOI: 10.11646/phytotaxa.575.2.3, URL: http://dx.doi.org/10.11646/phytotaxa.575.2.3
03B55D1DE25F6D51FA97FD6DD278FD3A.taxon	etymology	Etymology: — Refers to the rusty spots on the cap and stipe of basidiomata.	en	Ji, Rui-Qing, Xie, Meng-Le, Zhou, Ji-Jiang, Meng, Li-Peng, Li, Yu, Zhang, Zhong-Hui, Li, Guo-Jie (2022): Russula rubiginosus sp. nov. in Russula subsect. Maculatinae from Heilongjiang Province, Northeast China. Phytotaxa 575 (2): 140-148, DOI: 10.11646/phytotaxa.575.2.3, URL: http://dx.doi.org/10.11646/phytotaxa.575.2.3
03B55D1DE25F6D51FA97FD6DD278FD3A.taxon	materials_examined	Holotype: — CHINA. Heilongjiang Province: Wudalianchi City, ASL 300 m, 126 ° 11 ’ E, 48 ° 37 ’ N, 13 August 2018, Peng-Jie Xing & Yang Xu (HMJAU 58933, GenBank OL 828349).	en	Ji, Rui-Qing, Xie, Meng-Le, Zhou, Ji-Jiang, Meng, Li-Peng, Li, Yu, Zhang, Zhong-Hui, Li, Guo-Jie (2022): Russula rubiginosus sp. nov. in Russula subsect. Maculatinae from Heilongjiang Province, Northeast China. Phytotaxa 575 (2): 140-148, DOI: 10.11646/phytotaxa.575.2.3, URL: http://dx.doi.org/10.11646/phytotaxa.575.2.3
03B55D1DE25F6D51FA97FD6DD278FD3A.taxon	description	Description: — Basidiomata medium-sized. Pileus 40 ‒ 72 mm diam., fleshy, firm, first hemispherical, then turned applanate with depressed center after maturation, margin becoming somewhat sulcate with age, glabrous, corinthain pink (xxvii 3 ʹʹ d) to livid pink (xxvii 3 ʹʹ f) when juvenile, corinthain red (xxvii 3 ʹʹ) to corinthain pink (xxvii 3 ʹʹd) with age, center orient pink (ii 11 f) to orange pink (ii 9 f) when juvenile, smiona orange (ii 11 b) to orange pink (ii 9 f) with age; mostly more or less covered with small ochraceous tawny (xv 15 ʹ i) to mikado brown (xxix 13 ʹʹ i) spots. Lamellae adnate, crowded, up to 6 mm wide, more or less furcate towards the stipe, slightly anastomosing, fragile, light ochraceous salmon (xv 13 ʹ d) first, primuline yellow (xvi 19 ʹ) when mature or dry, often with rust spots at lamellae. Stipe cylindrical to slightly clavate with rounded base, enlarged towards the base, firm, 40 ‒ 60 × 8 ‒ 13 mm, surface minutely wrinkled, white (liii) when juvenile, becoming baryta yellow (iv 21 f) towards the base when old or dry, appearing ochraceous tawny (xv 15 ʹ i) to mikado brown (xxix 13 ʹʹ i) patches or spots when handled or with age, especially bottom. Context firm, white (liii) when juvenile, naples yellow (xvi 19 ʹ d) with age, distinctly yellowing when dry or bruised. Taste acrid. Odor indistinct. Basidiospores (40 / 2 / 2) 7 – 10 (12 –) × 6 – 9 μm, Q = (1.2 –) 1.3 – 1.25 (– 1.31), Q av. = 1.19 ± 0.05, broadly ellipsoid, ornamentation of moderately large and distant: 5 – 7 (– 10) amyloid spines in the circle of diameter of 3 μm on basidiospore surface, spines 1.0 – 2.0 μm high, mostly isolated, occasionally fused in short chains or crests (0 – 2 fusions in the circle), line connections very rare and short (0 – 1 line connection in the circle), not forming a mesh. Basidia (30 –) 40 – 53.7 × (13 –) 15 – 17 (– 20) μm, clavate to subclavate, thin-walled, oil granules present when viewed with KOH, 4 ‒ spored, sometimes 2 ‒ spored; sterigmata 6 ‒ 8 × 2 ‒ 3 µm. Subhymenium pseudoparenchymatic. Lamellar trama mainly composed of large sphaerocytes. Pleurocystidia 66 – 92 × 9 – 13 μm, fusiform, clavate to subclavate, often with a subacute tip, thin-walled, sometimes with a small appendage and dense crystal inclusions. Cheilocystidia 60 – 90 × 8 – 13 µm, mostly similar to pleurocystidia. Pileipellis is composed of suprapellis and subpellis; suprapellis strongly gelatinized, 140 – 250 μm thick, composed of dense, ascending or erect hyphal ends and protruding and near surface repent pileocystidia, terminal cells 15 – 45 × 2 – 3 μm, cylindrical, often constricted towards the apex; subpellis less gelatinized, 40 – 100 μm thick, hyphae 2 – 6 µm wide, dense, strongly intricate, often branched. Pileocystidia numerous and often large sized, narrowly to broadly clavate or fusiform, mainly two or three celled, occasionally one-celled, rarely with more cells, thin-walled, obtuse to subacute, usually inflated near apical part, with terminal cells measuring 30 – 50 × 6 – 8 µm, contents in Congo red heteromorphous, usually granulose, but sometimes partly crystalline or banded. Stipitipellis cutis composed of thin-walled, septate, cylindrical, hyaline hyphae 2 – 4 μm wide, caulocystidia present, dispersed, rare, mainly two or three celled, occasionally one celled, rarely with more cells, thin-walled, obtuse to subacute, usually inflated near apical part, with terminal cells measuring 33 – 65 × 5 – 7 μm. Clamp connections absent in all tissues.	en	Ji, Rui-Qing, Xie, Meng-Le, Zhou, Ji-Jiang, Meng, Li-Peng, Li, Yu, Zhang, Zhong-Hui, Li, Guo-Jie (2022): Russula rubiginosus sp. nov. in Russula subsect. Maculatinae from Heilongjiang Province, Northeast China. Phytotaxa 575 (2): 140-148, DOI: 10.11646/phytotaxa.575.2.3, URL: http://dx.doi.org/10.11646/phytotaxa.575.2.3
03B55D1DE25F6D51FA97FD6DD278FD3A.taxon	biology_ecology	Habitat and distribution: — Ectomycorrhizal fungi symbiotic with Q. mongolica. Solitary in July to August under Q. mongolica forests. Known from Northeast China.	en	Ji, Rui-Qing, Xie, Meng-Le, Zhou, Ji-Jiang, Meng, Li-Peng, Li, Yu, Zhang, Zhong-Hui, Li, Guo-Jie (2022): Russula rubiginosus sp. nov. in Russula subsect. Maculatinae from Heilongjiang Province, Northeast China. Phytotaxa 575 (2): 140-148, DOI: 10.11646/phytotaxa.575.2.3, URL: http://dx.doi.org/10.11646/phytotaxa.575.2.3
03B55D1DE25F6D51FA97FD6DD278FD3A.taxon	materials_examined	Additional specimens examined: — CHINA. Heilongjiang Province: Wudalianchi City, ASL 300 m, 126 ° 11 ’ E, 48 ° 37 ’ N, 13 August 2018, Peng-Jie Xing & Yang Xu (HMJAU 58934, GenBank OL 828348). Inner Mongolia Autonomous Region: Zhalantun County, Xiushui Scenic Area, ASL 370 m, 27 July 2013, Sai-Fei Li, Dong Zhao & Guo-Jie Li (HMAS 267826, GenBank KX 441111); ibid., 28 July 2013, Sai-Fei Li, Dong Zhao & Guo-Jie Li (HMAS 267741, GenBank KX 441095).	en	Ji, Rui-Qing, Xie, Meng-Le, Zhou, Ji-Jiang, Meng, Li-Peng, Li, Yu, Zhang, Zhong-Hui, Li, Guo-Jie (2022): Russula rubiginosus sp. nov. in Russula subsect. Maculatinae from Heilongjiang Province, Northeast China. Phytotaxa 575 (2): 140-148, DOI: 10.11646/phytotaxa.575.2.3, URL: http://dx.doi.org/10.11646/phytotaxa.575.2.3
