PLEUROTTTS 447 



of the pileus with a gelatinous layer under the cuticle. Spores white, 

 elliptical, 6-8 x 4-5 /A, granular. Cystidia fusiform, 50-60 x 12-15/n, 

 apex pointed, very thick walled. On stumps, and on the ground. 

 Aug. Jan. Rare, (v.v.) 



1452. P. pulmonarius Fr. Pulmonarius, belonging to the lungs. 

 P. 4-8 cm., cinereous, then tan colour, continuous with the stem, 



soft but tough, flaccid, obovate, or reniform; margin plane, or reflexo- 

 conchate. St. 1-5 cm. x 12 mm., or wanting, exactly lateral, hori- 

 zontal, or ascending, expanded into the pileus, round, villose. Gills 

 whitish, then livid, or cinereous, decurrent, but ending determinately, 

 moderately broad. Spores white, "8-10 x 2-3 p, or 10-12 x 3-4/u," 

 Sacc. On beech, and birch stumps. Sept. Rare. 



var. juglandis Fr. Fr. Icon. t. 87, fig. 2. Juglans, a walnut. 



Sessile, smaller than the type, caespitose. P. greyish-brown, obovate, 

 attenuated into a very short stem-like base. Gills concolorous, or 

 paler. On walnut trunks. Rare. 



1453. P. serotinus (Schrad.) Fr. Pat. tab. anal. t. 629. Serotinus, late. 

 P. 37 cm., yellow-green, fuliginous olive, then olive, thick, gibbous- 

 convex, then plane and ascending, reniform, or obovate, pellicle viscid 

 in wet weather; margin involute, then expanded and revolute. St. 

 1-2-5 x 1 cm., or wanting, lateral, yellow, dotted with fuliginous or 

 brownish squamules, forming a fuliginous zone near the gills. Gills 

 bright yellow, adnate, narrow, crowded, often branched. Flesh white, 

 with a gelatinous layer under the cuticle of the p. Spores white, sausage- 

 shaped, curved, 5-6 x 1-5-2/z, becoming 2-septate. Cystidia abun- 

 dant on gill edge, scattered elsewhere, with yellowish contents in 

 the upper part, cylindrical, or subfusiform, obtuse, or slightly clavate 

 at the apex, base ventricose, or attenuated; 40-53 x 8-10 x 5-8 /u, 

 at apex. On trunks and fallen logs. Sept. Dec. Uncommon, (v.v.) 



var. Almeni (Fr.) Big. & Guill. FT. Icon. t. 87, fig. 3, as Agaricus 

 (Pleurotus) Almeni Fr. Professor A. Almen. 



Differs from the type in its larger size, tawny fuscous p. and paler 

 st. and gills. Fallen logs. Nov. Rare, (v.v.) 



1454. P. mitis (Pers.) Berk. Outl. t. 6, fig. 9. Mitis, mild. 

 Entirely white, or becoming rufescent. P. 1-2 cm., thin, continuous 



with the st. in a straight line, horizontal, reniform. St. 6-12 x 6- 

 12 mm., definitely lateral, compressed and dilated upwards, sprinkled 

 with white, mealy squamules. Gills adnate, linear-lanceolate, very 

 crowded. Flesh white, with a gelatinous layer under the cuticle of the p. 

 Spores white, reniform, 4 x 2fi. On coniferous twigs and stumps. 

 Sept. Dec. Common, (v.v.) 



