Search on : Taxa descriptions

 


   
Literature:
 
Page number:86 
Remarks (internal):Typically subulate, up to 70 µm long hyphal ends of pileipellis and absence of dermatocystidia undoubtedly place the taxon in the subgenus Amoenula Sarnari. This species resembles Russula amoenicolor Romagn., R. violeipes Quél. and R amoena Quél. from Europe. However, all these three species have a different spore print colour which varies from IIa-IIc (Romagnesi 1996), or from IIa-IIIa (Sarnari 1998). Moreover, the red to purple colour of stipe base in R. amoenicolor; presence of distinctly globose lower cells of the pilear hyphae in R. violeipes and the comparatively narrower pleurocystidia and reddish stipe base in R. amoena further separate these three species from R. mukteshwarica. Molecular analysis gathered from rDNA sequencing of the ITS gene region (not shown) has also confirmed that the new species belongs to the subgenus Amoenula and is closely related to R. violeipes. 
Description type:Original description 
Description:Pileus 65-130 mm diam., planoconvex, becoming umbilicate with depressed center at maturity; pileipellis dry, viscid when moist, pruinose to subvelvety, dark purple, deep to very deep purple or deep to dark violet, light to brilliant or very greenish yellow at the center; margin slightly decurved, almost plain at maturity, irregularly lobed, splitted, peeling up to l/4th of the radius. Lamellae broadly adnate to adnexed, close (ca 7-9 per cm), forked from the base, brittle, cream to pale yellow or light greenish yellow; lamellulae present; edges even. Stipe 45-87 x 14-27 mm, cylindric to subclavate, dry, pruinose, light reddish purple at the top, gradually with white areas downwards but always with a white rim between the juncture oflamellae and stipe, pale greenish yellow (lemon yellow) at the base. Context stuffed, cream, changing light brown with phenol. Taste mild. Spore print white (Ia).
Basidiospores 7.6-9.3 x 7.3-8.2 µm, subglobose to globose (Q = 1-1.15, av. 1.05-1.10); ornamentation amyloid, composed of warts (= 0.75 µm long) and ridges forming incomplete reticulum. Basidia 30-45 x 7-9 µm, sub clavate to clavate, 4-spored; sterigmata = 6.5- 7 µm. Pleurocystidia 80-110 x 11-17 µm, abundant, emergent up to 40 µm, ventricose, subfusiform to fusiform, thick walled, content dense; wall up to 1.3 µm thick. Lamellae edge fertile, composed of basidia and cystidia. Cheilocystidia 70-100 x 11-16 µm, thick walled, same as pleurocystidia. Subhymenium layer narrow, up to 12 µm thick, cellular. Pileipellis two layered; upper layer composed of suberect to erect subulate, septate hyphae, 5-11 µm broad, pileocystidia absent; subpellis cellular.
Ecology - Russula mukteshwarica grows in close association with species of Quercus, Rhododendron and Myrica in moist deciduous to mixed subtropical to temperate (1800-2200 m) forests.
 
Taxon name: