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 Add this item to the list  Pleurotus albidus (Berk.) Pegler
   
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Page number:848 
Remarks (internal):The hyphal system of these basidiocarps is monomitic, similar to several Pleurotus species such as P. ostreatus, P. pulmonarius, P. populinus Hilber & Miller and P. abieticola Petersen & Hughes (Albertó et al 2002). P. albidus is characterized by its fragile nature, white to cream color and its remarkable laciniate-crenate margin. Several specimens exhibited great morphological variability, observed not only in collections from nature but also in fruit bodies obtained in culture. It seems as if certain species form basidiocarps similar to P. cornucopiae, characterized by their anastomosed lamellae on the stipe, such as BAFC 809; whereas others form more plane and shorter basidiocarps, without such characteristics, as BAFC 136 (see FIGS. 1, 11A, B). P. albidus is the species of major distribution in the Argentina, with several collections and strains obtained from diverse species of living trees to stumps and fallen trunks.  
Description type:Non-original description 
Description:Pleurotus albidus (Berk.) Pegler
Kew Bull., Addit. ser. 10:219, 1983.
Lentinus albidus Berkeley. 1843. Hooker J. Bot. 2:633.
Lentinus calvescens Berkeley & Curtis. 1856. Hook. J. Bot. 8:143.
Pleurotus jacksonii Berkeley & Cooke. 1877. J. Linn. Soc. London 15:363.
Panus laciniatocrenatus Spegazzini. 1880. An. Soc. Cient. Arg. 9:164.
Pleurotus laciniatocrenatus (Speg.) Spegazzini. 1919. Bol. Acad. Nac. Cienc. Córdoba 23:381-382.
Basidiocarp cornucopioid, clitocybioid, omphalloid to lentinoid (i.e., L. crinitus), usually gregarious in troops of 2-30 basidiomata. Pileus circular, infundibuliform (figs. 1, 11A, B),27-225 mm broad x 30-170 mm long, glabrous, hygrophanous, white to cream (C2Pl9, Maerz and Paul 1930), sometimes with brown color next to the attachment of the stipe, margin entire to laciniate-crenate, thin, usually incurved (especially when dr y), frequently lemon yellow through drying. Lamellae deeply decurrent, becoming anastomosing ridges on the stipe, subdistant to crowded, 6-8 mm broad, white. Stipe 35-80 mm long x 5-33 mm diam, upward fluted through lamellar bases, tapering downward, usually curved-ascendant, dull white, felty, occasionally with hairs at the base. Spore print white to cream. Odor fungal. Usually on fallen trunks, rarely living trees of Salix sp., Ulmus sp. and Platanus sp.
Basidiospores (5.2-)8-9.5(-11.4) x 2.6-3.2 µm; Q = 3.15 long, very variable in length, oblong, smooth, hyaline, thin-walled, IKI- (FIG. 2A). Basidia 18.5-24 x 4.5-5.2 µm subcylindrical to clavate, hyaline, 4-spored, numerous, fusiform to mucronate, nonemergent basidioles measuring like the basidia (fig. 2C). Cheilocystidia absent. Hyphae of pileus context generative, hyaline, frequently branched, 4.0-12.5 µm diam (fig. 2B). Hyphae of hymenophoral trama 4.5-6.5 µm diam, irregular to subparallel, close, occasionally oleiferous hyphae present, conspicuously yellow in KOH (fig. 2C). Subhymenium not well developed, 13-17 µm thick, with pseudoparenchymatous, isodiametric, hyaline hyphae (FIG. 2C). Hyphae of stipe 4.5-18.5 µm diam, hyaline, generative, thin-walled and thick-walled (more than 0.4 µm thick), branched (fig. 2D); on the surface, hairs formed by hyaline, generative, branched, thick-walled (0.3-0.7 µm thick) hyphae 2.5-5.5 µm diam Hyphae of pileipellis 2.5-4.5 µm diam, hyaline, thin- to thick-walled; pileocystidia not observed.
Culture characters. - Mycelium hyaline, with thick strands that give a feathery aspect, whitish, cottony zones near inoculum. Colony growth radial, loose and felty. Margin irregular, festooned, to regular according to the strain studied. Odor like almonds. Mycelial mat covering Petri plates in 3-4 wk. Occasionally, orange exudate droplets produced principally in the center and near the inoculum when all Petri plates were fully grown.
Advancing mycelium with hyaline, thin-walled, clamped hyphae 2-4.6 µm diam. At the center of the colony generative, clamped, broader and less branched hyphae 1.5-4.7 µm diam. The number of hyphal branches increases when the colony becomes old, near the inoculum 2.0-4.7 µm diam. Microdroplets 2.0-5.0 µm diam.
Geographic distribution. - Northeastern and central Argentina.
 
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