16. Leucoagaricus purpureolilacinus Huijsman in Fungus 25: 33. 1955. - Fig. 72.
Leucoagaricus purpurcorimosus Bon & Boiffard in M. Bon in Doc. mycol. 8 (29): 37. 1978. - Leucoagaricus purpureorimosus f. pallidus Bon & Boiffard in M. Bon in Doc. mycol. 8 (29): 37. 1978.
SEL. ICON. - Lonati in Micol, Veget. medit. 6: pl. 8. 1991; Migl. & Mohr in Micol. ital. 21 (II: pl. 64. 1992 (both as L. purpureorimosus).
SEL. DESCR. & FlGS. - Huijsman in Fungus 25: 33. 1955.
VERN. NAME - Purperen champignonparasol.
Pileus 35-60 mm, paraboloid-hemispherical at first, bluntly conical, expanding to applanate with low broad umbo, purplish brown, dark purplish red-brown. dark vinaceous brown (Mu. 5 YR 5/3, near 10 R 3/1.5) at centre, in rest of pileus pink-brown, pale brown, pale ochra ceous (5 YR 6/4, 10 YR 613), finely fibrillose-squamulose, in bigger specimens with radially radiating, reticulately connected, slightly raised to sharp ridged darker venation, with a covering which is bro ken up at pileus margin. showing the white underground, with white velar remnants at margin. at least when young. Lamellae, L = 65-80, 1 = 1-3, crowded, free and remote from stipe, segmentiform, subven tricose, 4-6 mm wide, white to pale cream, with concolorous or white flocculose edge. Stipe 45-75 X 6-14 mm, gradually widened, but more often tapering towards base, straight or flexuous, hollow, with rooting basal part, white, with faint lilacinous tinge at base, finely fibrillose, slightly shiny, glabrous. Annulus evanescent, ascending, or descend ing, membranous-felted, white, later brownish. Context in pileus thick, white and Juil, white and shiny in stipe, not discolouring. Spore print white with a pale pinkish tinge. Spores 7.5-11.5 X 4.0-6.5 um, on average 8.7-10.3 X 4,2-5.3 um, Q = 1.6-2.3, Qav = 1.8-l.95, amygdaliform in side-view, often with apical papilla, rounded-fusiform in frontal view, without germ pore, dextrinoid, congophilous, cyanophilous, with pink inner wall in Cresyl Blue. Basidia 18-29 X 6.5-10 um, 4-spored, rarely 2-spored. Lamella edge sterile. Cheilocystidia 19-41 X 6,0-15 um, variable in shape, c1avate, rarely broadly c1avate, cylindrical, often with median con striction, narrowly lageniform, slightly thick-walled, with crystals in upper part or on apex only. Pleurocystidia absent. Pileus covering in centre of pileus with gelatinized adnate hyphae, c. 3.0 um in diam., Iying on top of ellipsoid. coloured elements; near pileus margin with long cylindrical adnate elements, up to 300 X 15 um, with encrusting pigment. Stipitipellis a cutis of narrow, 3.0- 10 um wide, colourless, cylindrical elements. Clamp-connections absent. HABITAT & DISTR. - Solitary or in small groups, saprotrophic and terrestrial, in dune grasslands, in woods on the inner side of the dunes, probably also in woods on loamy calcareous soil in Limburg, rare in the Netherlands. Oct.-Nov. Rare and widespread along the coasts in Europe from the Netherlands southwards. Leucoagaricus purpureolilacinus is characterized by the dark pur plish colours at the centre of the pileus, cystidia crowned with crys tais, and rather big spores which resemble those of Lepiota subgracilis in shape. Leucoagarieus purpureorimosus Bon & Boiffard is considered a synonym, as no discriminating characters could be found. Both taxa are reported from dune areas.
