Lactarius sect. Uvidi (Konr.) Bon.

Bera, Ishika, Das, Kanad & Datta, Bejoysekhar, 2022, A new species of Lactarius sect. Uvidi (Russulaceae) from India, Phytotaxa 576 (2), pp. 203-212 : 209-210

Key to the species of Lactarius sect. Uvidi known worldwide

1a. Cap violaceous to brownish or greyish ..............................................................................................................................................2

1b. Cap cream to yellowish ....................................................................................................................................................................12

2a. Habitat sub-alpine (> 2700 m).............................................................................................................................................................3

2b. Habitat temperate deciduous (800–2700 m).......................................................................................................................................5

3a. Basidiospores densely reticulate; cap greyish buff to clay buff ................................................................................. L. pseudouvidus

3b. Basidiospores incompletely reticulate; cap brownish to vinaceous ...................................................................................................4

4a. Cap brownish vinaceous, grey to dark vinaceous; larger basidiospores (8.8–11.9 × 6.7–8.6 μm); odor of cedar-oil ......................... ............................................................................................................................................................................. L. brunneoviolaceus

4b. Cap umber to sienna to brown vinaceous; rather smaller basidiospores (8.0–10.5 × 6.9–8.8 μm); odor of pear .......... L. pyriodorus

5a. Pileus with a distinct papillate umbo (papilla up to 7 mm high).................................................................................... L. hrdovensis

5b. Pileus without any papilla ..................................................................................................................................................................6

6a. Cap slightly zonate with watery or vinaceous spots, greasy but not slimy .......................................................................... L. luridus

6b. Cap hardly zonate with no such spots, slimy, viscid to glutinous ......................................................................................................7

7a. Cap covered with bundles of glutinous hairs .................................................................................................................... L. formosus

7b. Cap never covered with glutinous hairs .............................................................................................................................................8

8a. Basidiospores with rounded warts and ridges ....................................................................................................................................9

8b. Basidiospores never with rounded warts and ridges ........................................................................................................................10

9a. Stipe slender, shiny when dry, slightly slimy when young and fresh.................................................................................... L. uvidus

9b. Stipe thick, dry and unpolished, not becoming shiny....................................................................................................... L. montanus

10a. Cap never zonate; taste bitter; context turning pale violet to greyish violet on exposure, basidiospores 6.0–9.5 × 5.0–8.0 μm ........ ................................................................................................................................................................................... L. indoviolaceus

10b. Cap azonate to zonate; taste mild or acrid; context turning violet to purple on exposure, basidiospores 7.5–11.3 × 6.4–8.5 µm...... ..........................................................................................................................................................................................................11

11a. Taste mild; cap greyish buff to brownish violet; context turning dark purple on exposure; larger basidiospores 7.6–11.3 × 6.4–8.5 µm.................................................................................................................................................................................... L. violascens

11b. Taste acrid; cap pale olive; context turning violet on exposure; smaller basidiospores 7.5–9.5 × 7–8.5 µm....... L. olivaceopallidus

12a. Cap margin bearded or hairy; fruitbodies medium to large (30–160 mm).......................................................................................13

12b. Cap margin smooth or tomentose only when young; fruitbodies smaller (10–70 mm) ...................................................................14

13a. Cap whitish chrome to pale cream, hairy only at margin; stipe short (length 20–30 mm) ........................................ L. dryadophilus

13b. Cap brighter yellow, abundant hairs and scales all over; stipe long (length 40–125 mm).................................... L. repraesentaneus

14a. Cap 10–50 mm .................................................................................................................................................................................15

14b. Cap larger (> 50 mm) ........................................................................................................................................................................16

15a. Fruitbodies slender and fragile; cap sometimes ochraceous in the centre, margin hardly crenulate; basidiospores almost reticulate ............................................................................................................................................................................. L. salicis-herbaceae

15b. Fruitbodies not quite fragile or slender; cap with no such ochraceous color, margin sometimes crenulate; basidiospores not reticulate .............................................................................................................................................................. L. salicis-reticidatae

16a. Lamellae and context turning dark brownish violet to dark livid red when bruised; taste acrid; basidiospores ornamentation reaching 1 µm high............................................................................................................................................................................. L. flavidus

16b. Lamellae and context turning lilac when bruised; taste mild to bitter; basidiospores ornamentation reaching 0.5 µm high .............. ........................................................................................................................................................................................... L. aspideus