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 Add this item to the list   Pleurotus ostreatus (Jacq.: Fr.) P. Kummer
Page number:853 
Remarks (internal):Fruit bodies of different collections showed great variability, characterized by sclerified hyphae or thin-walled hyphae in the stem and hymenophoral trama and by the pileipellis being of variable thickness. This indicates the necessity to make further studies to separate Pleurotus ostreatus and P. pulmonarius, such as mating (Vilgalys et al 1993, Lechner et al 2002) or molecular studies (Thorn et al 2000, Gonzales and Labarère 2000).  
Description type:Non-original description 
Description:Pleurotus ostreatus (Jacq.: Fr.) P. Kummer
Führer der Pilzkunde: 105. 1871.
Agaricus ostreatus Jacq. 1775. Fl. Austr. 3: pl. 288.
Agaricus ostreatus Jacq.: Fr. 1821. Syst. Mycol. 1:182.
Agaricus salignus Pers. 1801. Syn. Meth. Fung: 479.
Agaricus salignus Pers.: Fr. 1821. Syst. Mycol 1:183.
Pleurotus salignus (Pers.: Fr.) P. Kummer. 1871. Führ Pilzk: 105.
Pleurotus columbinus Quel. 1881. in Bres., Fungi tridentini 1:10.
Pleurotus floridanus. Singer. 1946. Pap. Mich. Acad. Sci. 32:134.
Pleurotus florida Eger. 1965. Arch. Mikrobiol. 50:343. nom. nud.
Pileus 65 x 80 mm when dry; caespitose, smooth (figs. 8A, 11H-J), margin involute at first, solid, brownish yellow (Munsell, 10YR 6/6). Basidiomata obtained in culture with pileus 110 x 130 mm, with similar characters to collections obtained in field but the basidiocarps developing more isolated. Lamellae decurrent, close, broad, ca 5 mm, not very thick, pale yellow (Munsell, 2,5Y 8/4), margin entire. Stipe 15-20 x 11-15 mm, eccentric-lateral, short, surface smooth. Flesh white, thin, ca 2 mm thick, corky. Odor fungal. Spore print white to cream.
Spores (8-)8.3-10.7(-13) x 3.1-3.6 µm Q = 2.4; cylindrical, hyaline, not amyloid, smooth (fig. 8B). Basidia 29-31 x 7-10 µm, club-shaped, 4-spored (fig. 8C). Cheilocystidia not observed. Pleurocystidia absent or similar to basidioles. 23-30 x 5-6 µm. Sub-hymenium 20-23 µm broad. Hymenophoral trama not completely irregular, with sclerified hyphae in some collections 4.7-10.4 µm diam, or thin-walled, 2.5-4.2 µm diam (fig. 8D). Oleiferous hyphae not observed. Hyphae of context branched 2.6-6.2 µm (fig. 8F). Hyphae of stipe thin-walled 3.1-5.2 µm diam, scantily branched and constant diameter to sclerified 5.2-7 µm diam (fig. 8E). Pileipellis variable, according to the collections, 40-110 µm thick; generally larger than 100 µm thick. Monomitic.
Culture characters. - Mycelium hyaline, growth feathery, with whitish arachnoid zones near the inoculum; increased aerial mycelium and more cottony at the second week. Margin irregular. Bleached zones at reverse of agar. Odor not distinct. The mycelium covered Petri plates between 1 and 2 wk. Primordia of fruit bodies were observed.
Advancing mycelium with generative, clamped, hyaline, regularly branched hyphae 1.0-2.5 µm diam. In the middle of the colony hyphae are generative, clamped, thin-walled, regularly branched, 1.0-5.0 µm diam. Mycelium near inoculum with generative, thin-walled, regularly branched and variable diameter hyphae 1.5-5.2 µm diam. Microdroplets 1.5-2.0 µm diam.
Geographic distribution. - East central and southwestern Argentina.
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