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Typhula maritima on coastal dunes in Ishikari and Yoichi, Hokkaido, northern Japan, is illustrated as a new species on the basis of morphology and molecular evidence. The sclerotia in the sand had mycelial strands that extended upward to support basidiocarps. Mycelial strands also connected sclerotia with plant tissues of the dunegrass Eylmus mollis Trin. Typhula maritima is psychrotrophic and halotrophic, and sclerotia fl oated on seawater for 1 week. These physiological characteristics are important factors for adaptation to the coastal dune environment. Inoculation tests indicated that T. maritima could grow on living E. mollis, but it was not pathogenic. The results suggested that this fungus was, at least, not an active pathogen in the coastal dune ecosystem. Ex-holotype is TH-AIST-Tm-1 (= NBRC 104266).

First record of Pluteus chrysophaeus and reexamination of Pluteus leoninus from Japan P. chrysophaeus. Therefore, we redescribed and illustrated P. leoninus based on the new Japanese material.The specimens examined in this study are deposited in the herbaria of the Hokkaido University Museum (SAPA) and the National Museum of Nature and Science (TNS). Macroscopic characters were described by observations on dried or fresh materials. For light microscopic observations, sections of dried specimens were mounted in water, 3% or 5% (w/v) KOH, and phloxine B solution on glass slides. Thirty randomly selected basidiospores were measured under a light microscope at 1000× magnifi cation. Length measurements excluded the apiculus for basidiospores. The abbreviation Q is the ratio of length to width of basidiospores.Pluteus chrysophaeus (Schaeff.) Quél., Mém. Soc. Émul. Montbéliard, Sér. II 5:82, 1872.Figs. 1-6Basidiomata pluteoid. Pileus 1.7-2.3 cm broad, campanulate when young, later expanded to convex or applanate, yellow to lemon-yellow or sometimes ocraceous, with pale brownish umbo at center, irregularly pulvinate, rugosestriate, strongly yellow with radially sulcate-striate at margin, subcutis yellow to pale yellow. Lamellae free, crowded, pinkish, edges sometimes pale brown. Stipe 2.9-3.5 × 0.2-0.4 cm, cylindrical, often compressed, pale lemon yellow to yellowish-white, basal part pale brown, lengthwise fi brillose striate, solid, at base clavate, with white rhizomorphs, context yellowish-white. Spore print pinkish. Basidiospores ovoid to broadly ellipsoid, rarely subglobose, 6-7 × 5-6 µm, Q = 1.0-1.4, surface smooth, with small oil drops. Basidia 18-33 × 7-9 µm, short clavate, 4-spored, without basal clamp-connections. Cheilocystidia crowded, 30-75 × 15-23 µm, colorless to pale yellow, lageniform with peduncle, fusiform to clavate, with granular contents at upper part, without clamp-connections, thinwalled. Pleurocystidia scattered, 50-75 × 12-21 µm, colorless to pale brown, ampulliform to lageniform with peduncle, often with elongate rostriform at apex, without clampconnections, thin-walled. Pileipellis hymeniform, composed of pyriform to clavate with pedunculate elements, 22-40 × Abstract Pluteus chrysophaeus is described as a new record for Japanese mycobiota. Pluteus leoninus, reported for the fi rst time from Japan by Imai (1938), probably represents P. chrysophaeus. The new Japanese specimens of P. leoninus is redescribed and illustrated.

A Marasmius-blight fungus, Marasmiellus mesosporus, is newly recorded from sand dunes of the Japanese coast. Macro-and microscopic features and ecological characteristics of the species are described and illustrated based on Japanese and European specimens.

Specimens including the holotype of Pluteus atrofuscens, a morphologically poorly known species reported from Japan, are examined, and it is newly defined as the third species belonging to the section Villosi. This species is described with the aid of line drawings showing the microscopic characteristics.Keywords Japan Á Infrageneric classification Hitherto, 25 taxa of Pluteus, including ten new species, have been described from Japan (