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 Add this item to the list   Pleurotus (Fr.) P. Kummer (1871)
Page number:846 
Remarks (internal):Mycologists who studied this taxon (Singer 1986, Kühner 1980, Pilát 1935, Hilber 1982, Moser 1986, Watling and Gregory 1989) have subdivided it differently.
In this paper, we adopt the subdivision proposed by Hilber (1982), who divided the genus Pleurotus in three subgenera, to which we add Subgenus tuberregium. Singer (1961b, 1986) considers this a subgenus of Pleurotus and Pegler (1975, 1983) a species of Lentinus. Thorn et al (2000) have demonstrated that its mycelium has microdroplets. We have not found this species in Argentina.
Subgenus Tuberregium Sing.: Pileus white to brown, veil not well developed, Stipe eccentric to subcentral; without coremia; Hyphal system dimitic. A conspicuous sclerotium is produced.
Subgenus Pleurotus: Hyphal system in mature specimens monomitic or dimitic, with a distinct stipe; neither coremia nor veil present. Spore print white, cream, lilac or pinkish.
i) Species with a monomitic hyphal system: P. ostreatus (Jacq.: Fr.) P. Kummer (with var. ostreatus and var. columbinus Quél. apud Bres.), P. pulmonarius (Fr.) Quél. and P. albidus (Berk.) Pegler.
ii) Species with a dimitic hyphal system: P. djamor (Fr.) Boedijn, with three varieties, according to Corner (1981): var. djamor, var. roseus Corner and var. cyathiformis Corner.
Subgenus Coremiopleurotus O. Hilber: coremia present on lamellae, base of stipe or mycelia or on the substrate; pileocystidia present and well developed; with or without veil; stipe eccentric or lateral. Hyphal system monomitic; spore print white, cream, never livid or pinkish.
P. cystidiosus O.K. Miller
Subgenus Lentodiopsis (Bubák) O. Hilber: Basidiocarps with conspicuous veil; distinct stipe; hyphal system dimitic, without coremia.
P. rickii Bres.
Description type:Non-original description 
Description:Pleurotus (Fr.) P. Kummer (1871)
Champignons du Jura & Vosges p. 62. 1872 em., nomen conservandum.
Spec. Typ.: Pleurotus ostreatus (Jacq. et Fr.) P. Kummer.
Agaricus trib. Pleurotus Fr., Syst. Mycol. 1:178. 1821.
Crepidotus Nees ex S. F. Gray, Nat. Arr. Brit. Pl. 1:616. 1821.
Pleurotus P. Kummer, Führ. Pilzk. p. 24. 1871.
Pleurotus Quél., Enchir., p. 147. 1886.
Dendrosarcus Paulet ex Kunze. Rev. Gen. Pl. 2:462. 1889 nom. nud.
Antromycopsis Pat. & Trabut, Bull. Soc. Myc. Fr. 13: 215. 1897 (imperfect form of sect. Coremiopleurotus (cfr. Pollack & Miller, Mem. N. Y. Bot. Gard. 28:174-178. 1976).
Lentodiopsis Bubák, Hedwigia 43:169. 1904 (type L. albida Bubák, l. c.).
Lentodiellum Murr., Mycologia 7:216. 1915 (type Panus concavus Berk.).
Nothopanus Sing., Mycologia 36:364. 1944.
Pterophyllus Lév., Ann. Sc. Nat. III 2:178. 1844 (type P. bovei Lév.).
Basidiomes usually large, fleshy, solitary to imbricate, flabellate to dimidiate, glabrous to tomentose, white, cream, gray, pink, brown, more rarely blue, yellow or lilac. Stem short, solid, eccentric to lateral, rarely subcentral. Lamellae decurrent, sometimes anastomosing to the stem, light-colored, thin to broad, margin entire. Veil present or absent at margin of pileus or forming an annular zone on the stem. Spore print white, cream, pinkish or lilac.
Spores cylindrical to subcylindrical, thin-walled, hyaline, not amyloid or dextrinoid, without germ pore. Cheilocystidia absent or poorly developed, disappearing early, thin-walled, clavate or mucronate. Subhymenium well developed, hymenophoral trama irregular. Pileipellis frequently poorly developed, with parallel radial hyphae, sometimes pigmented. Hyphal system monomitic or dimitic, gelatinous "tissue" usually absent; clamps present. Lignicolous.
Observations. - The genus Pleurotus does not have clear distinctive characters as occurs with other genera.
The hyphal system may be monomitic or dimitic, without binding hyphae. This character might confuse the boundaries with other related genera, such as Lentinus (Stankoviová, 1973). There exists a clear delimitation in Pleurotus between species with a monomitic hyphal system, thin- or thick-walled generative hyphae, such as P. ostreatus, P. pulmonarius, P. albidus, P. cystidiosus, and dimitic ones, such as P. djamor and P. rickii.
All Pleurotus species have thin-walled, smooth, cylindrical to subcylindrical spores. They may be small (<8 µm long) such as P. auriovillosus (Corner 1981), medium (8-12 µm) such as P. albidus and large (>13 µm long) such as P. cystidiosus.
The pileipellis is generally a cutis. In P. cystidiosus and P. djamor, there may be pileocystidia. It is important to stress the significance of the broad pileipellis to differentiate P. ostreatus from P. pulmonarius, the latter much thinner than the former.
One of the distinctive characters of the genus is an irregular hymenophoral trama combined with a well developed subhymenium that, according to Singer (1986), is always more than 7 µm thick.
Pleurotus does not exhibit chemical reactions. Oleiferous hyphae can be distinguished in different "tissues" of the basidiocarp that turn yellow with 5% KOH. Spores of all known species of Pleurotus are negative in Melzer's solution.
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