Zs. P. Komáromy szerk.: Studia Botanica Hungarica 13. 1979 (Budapest, 1979)
Bohus, Gábor: Some results of systematical and ecological research on Agaricales, VII.
Lepista irinoides sp. n. For a long time we have been of the opinion that beside the species Tricholoma ( Lepista ) irinum , there is another similar species. Now as MOSER (1978) drew attention to this we would like to publish our observations. The .differences between the two species are chiefly as follows: Tricho- loma irinum changes only slightly or shows hardly any change in colour while undergoing drying or during careful preparation without heat. While undergoing drying the other species, Lepista irinoides becomes coloured with brown; this colour may appear in older specimens on the habitat also, where rarely the colour of the gills may even darken into dirty brown. The margin of Tricholoma irinum is smooth, but that of Lepista irinoides is grooved as at Tricholoma acerbum . It is visible on Table 583 of CETTO (1976) too (s. n. Tricholoma irinum ; specimen on right). The spores of Lepista irinoides are punctate or finely verrucose, what is visible without immersion also, while the spores of Tricholoma irinum show generally a similar surface structure only if stained suitably (BON. 1974; KÜHNER 1976).* Pileus 4-14 cm latus, carnosus, e convexo vel gibboso-convexo expansus, glaber, primitus cremeus, deinde roseolocremeus, isabellirius, ochraceus, carneoloochraceus, brunneoloochraceus, brunneolus cum tinctura roseola suffusus, per exsiccationem brunnescens, cuticula separabilis; margine primitus involuto, primitus breviter (ut apud Tricholoma acerbum ) et densiter costato, deinde + distante et longiore. Lamellae 4-8 mm, confertae, emarginatae et dente decurrentes, primitus pallide ochraceae vel carneoloochraceae, deinde isabellinae, carneolobrunneolae; senectute obscurantes, brunnescentes. Stipes 4-9 cm longus, 0.8-4 cm crassus, solidus, cylindraceus, clavatus vel basi attenuatus, rariter ventricosus, albidus vel parum pileo concolor, tactu brunnescens vel ochrascens, longitudine fibrilloso vel costato subreticulatus. Caro alba, albida. Odor Iridis. Sapor dulcidulus vel quasi farinaceus. Sporae in cumulo albae vel vix cum tinctura roseola. Sporae 7-8, 5 x 3,8-4, 6 um, ellipsoideae vel elongato ellipsoideae, punctato asperulae. Basidia clavata, 20-30 x 6-8 jum. * The opinion of KÜHNER (1976) on this question is as follows: "Sans coloration elles ( - spores de L. irina - ) semblent pratiquement lisses ou tout au plus subtilement et confusément ruguleuses, parfois un peu moins confusément dans leur partie supérieure. Dans le bleu lactique la paroi apparait indiscutablement ornée à l'immersion, car les ornements sont cyanophiles; . . . En Amérique du Nord, BIGE LOW et SMITH distinguent de irina var. irina, dont la sporée est incarnat crème pâle (pale pinkish buff deRidgway) et dont l'ornamentation sporale est sensible à l'immersion, un pseudoirinaBIGELOW et SMITH, dont la sporée à une couleur plus vive (pale pinkish cinnamon de Ridgway) et dont l'ornamentation sporale n'est sensible qu'en microscopie électronique. Ils distinguent en outre irina var. luteospora BIGELOW et SMITH, dont l'ornamentation sporale est sensible au microscope à lumière., comme chez var. irina, mais dont la sporée est plus colorée (près de pinkish buff de Ridgway). . . 11
