Polish Botanical Journal 50(2): 221–224, 2005 PLUTEUS AURANTIORUGOSUS (FUNGI, AGARICALES) IN POLAND ANDRZEJ SZCZEPKOWKI & ANNA KUJAWA Abstract. The paper reviews the localities of Pluteus aurantiorugosus (Trog) Sacc. in Poland and presents a new one from the Mazovia region. Key words: agaricoid fungi, Pluteus aurantiorugosus, distribution, Poland Andrzej Szczepkowski, Department of Mycology and Forest Phytopathology, Warsaw Agricultural University, Nowoursynowska 159, PL-02-776 Warsaw, Poland; e-mail: [email protected] Anna Kujawa, Agricultural and Forest Environment Research Centre, Polish Academy of Sciences, Turew Field Station, Szkolna 4, PL-64-000 Kościan, Poland; e-mail: [email protected] The genus Pluteus Fr. is widely distributed in the genus in Poland. Among 12 species of the genus temperate zone. It belongs to the Pluteaceae family regarded as threatened in Poland, it is placed in the within the order Agaricales. The family comprises highest category of threat, described as vulnerable about 300 species widely distributed around the (V) (Wojewoda & Ławrynowicz 1986, 1992). Wo- world (Kirk et al. 2001). These saprotrophs occur jewoda (2003) proposes assigning category E (en- mostly in forests, scrubs and parks. Usually they dangered) to the species. In the Polish literature develop on decomposed wood, on sawdust and there is some controversy about its distribution. dead remains of herbaceous plants, but some spe- According to Wojewoda & Ławrynowicz (1986, cies grow directly on soil (Kreisel 1987; Vellinga 1992) and Wojewoda (2003) the species does occur 1990; Skirgiełło 1999). in Poland, but according to Skirgiełło (1990) it has Pluteus aurantiorugosus (Trog) Sacc. is a rela- not yet been recorded in our country. tively rare species occurring in Europe and North America (Vellinga 1990). It has been placed on Pluteus aurantiorugosus (Trog) Sacc. (Fig. 1) red lists as a threatened fungus in Poland and some other countries including Denmark (Vest- Beibl. Hedwigia 35(7): 5. 1896. – Agaricus auranti- erholt 1998), Germany (Schnittler 1996), the orugosus Trog, Mitt. Naturf. Ges. Bern, 32: 388. 1857. – Pluteus leoninus var. coccineus Massee, Brit. Fungi. Netherlands (Arnolds 1989), Slovakia (Lizoň Fl. 2: 291. 1893. – Pluteus caloceps Atk., Annls mycol. & Bacigálová 1998), Sweden (Gärdenfors 2000) 7: 373. 1909. – Pluteus coccineus (Massee) Lange, Fl. and Switzerland (Senn-Irlet et al. 1997). It also fi g- Agar. Dan. 2: 88. 1937. ures on a proposed red list of European threatened species (Ing 1993). According to records, the usual The bright scarlet or orange cap clearly distin- habitat for the species is the wood of living or dead guishes the species from other representatives of broad-leaved trees such as Acer, Alnus, Fraxinus, the same genus. Cap convex to plane, sometime Populus, Quercus or Ulmus growing in fl oodplain umbonate, 1–6 cm in diameter. Cap surface al- forests, parks, and along roads (Kreisel 1987; Vel- most smooth, but velvety or roughly veined in linga 1990; Skirgiełło 1999; Škubla 2003). central part. Stem up to 7.5 cm high, up to 0.6 cm Pluteus aurantiorugosus is one of the least thick, straight or sabre-like, curved, equal, solid frequently encountered representatives of the or tubular, and swelled at the base, fi brillose in 222 POLISH BOTANICAL JOURNAL 50(2). 2005 jakiewicz 1964), and the last one from the Nowa Huta district in Kraków, dated 1967 (Wojewoda 1991, 1996). The present fi nding from Skarysze- wski Park in Warsaw is the fi rst record for almost 40 years. The new locality of Pluteus aurantiorugosus was in a historic park today named after the Polish composer Ignacy Paderewski. The park was established in the early 20th century on wa- terlogged meadows of Skaryszew village fl ooded by Vistula waters. Its landscape park features have been successfully preserved. Nineteen fruitbodies were found in October 2004 (all specimens from the 1960s were collected in September). The fruit- bodies were growing on a decomposing stump of Populus sp., 60 cm tall and 100 cm thick; this is a new host for the Polish population of P. au- Fig. 1. Fruitbodies of Pluteus aurantiorugosus (Trog) Sacc. rantiorugosus. The stump with numerous suckers growing in a group on a poplar stump in Skaryszewski Park. Phot. Andrzej Szczepkowski. was located in an open spot in the southern part of the park. The fruitbodies grew in small clus- texture, yellowish but darker at bottom. Gills ters or solitary on the top and side of the stump. ventricose, crowded, initially whitish, later Unfortunately the stump was removed, together turning salmon pink with white-fl occulose with its precious fungus, during groundskeeping margins. Flesh whitish, odorless. Spore-print work in the beginning of 2005. cinnamon-pink. Stiptipellis with cylindrical, The distribution of P. aurantiorugosus in Po- color less elements. Pileipellis with clavate and land is mapped in Figure 2. Acronyms of herbaria sphaeropedunculate elements having yellowish given in the list of localities follow Holmgren et al. intracellular pigment. (1990) and Mirek et al. (1997). The abbreviation The features mentioned above, as well as other properties of the macroscopic and microscopic structure of the fruitbodies collected in the new locality, were consistent with those given by Vel- linga (1990) and Skirgiełło (1999). High quality photographs, together with a description of mac- roscopic features of the species, are provided by Læssøe & Conte (1997), Škubla (2003) and Hagara et al. (2004). The information about localities presented in the paper came from available literature and from herbaria descriptions. The authors did not verify the identifi cations of specimens collected in those herbaria. So far the fungus has been reported from four localities in Poland. Two were in national parks, one in a reserve, and one in an urban area, all found in the 1960s. The fi rst record, from 1962, comes Fig. 2. Distribution of Pluteus aurantorugosus (Trog) Sacc. in from the Wielki Las reserve in Wielkopolska (Bu- Poland. (cid:1) – previously known localities, (cid:2) – new locality. A. SZCZEPKOWSKI & A. KUJAWA: PLUTEUS AURANTIORUGOSUS IN POLAND 223 WAML stands for the Herbarium of the Depart- GÄRDENFORS U. (ed.) 2000. 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