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Russula Pyriodora, a New Fragrant Species Described from Finland

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Russula Pyriodora, a New Fragrant Species Described from Finland Karstenia 51: 23–30, 2011 Russula pyriodora, a new fragrant species described from Finland. JUHANI RUOTSALAINEN and SEPPO HUHTINEN RUOTSALAINEN, J. & HUHTINEN, S. 2011: Russula pyriodora, a new fragrant spe­ cies described from Finland. – Karstenia 51: 23–30. Helsinki. ISSN 0453­3402. A new species, Russula pyriodora, is described based on Finnish material. It is char­ acterized by an appearance of R. betularum, but has a distinctive odour of pears. Other differentiating features, both macroscopical and microscopical, are also discussed. The new species is also compared with the type of R. alborosea, which is a likely synonym of R. mairei. Key words: Russulaceae, Russula, Atropurpurea, Russula pyriodora, Finland, taxonomy Juhani Ruotsalainen, Metsätie 12 A 4, FI–71310 Vehmersalmi, Finland; e-mail: juhani. [email protected] Seppo Huhtinen, Herbarium, University of Turku, FI–20014 Turku, Finland; e-mail: [email protected] Introduction typification by Kärcher (1996) is based on two fruitbodies which are not conspecific. Selection New taxa of the genus Russula Pers. are en­ of a type without actually carefully studying ma­ countered in Finland every year. In most cases terial is never advisable. For example, descrip­ these new finds consist of only a few fruitbodies. tions like those by Romagnesi based on “clear” Furthermore, it is often very laborious to find a type specimens, are of questionable value when second collection, even from the existing, plen­ it is realized that those “clear” type collections tiful collections. Consequently, during the past are mixtures of more than one taxon, e.g. R. decades the senior author has refrained from amoenoides Romagn. and R. terenopus Romagn. describing such finds as new species – not even Hence, comparisons based on literature only, when more or less convinced about their nov­ have led to many misunderstandings. elty. In such cases the great overall variability, Being aware of the situation mentioned above, typical for most species of Russula, would not descriptions of new species of Russula, based on be reported properly. In Finland we know many only three collections from two sites in Finland, distinctive species, which are closely related to is seldom advisable. Even in the current clear existing, well known species. Describing these is cut case, where we feel confident enough about hindered by the lack of existing type specimens. the new status of our finds, one could not ignore Furthermore, many of the neo­ and epitypifica­ type studies. Reumaux et al. (1996) described tions by Sarnari (1998, 2005), based on Romag­ R. alborosea Reumaux which he later combined nesi’s collections, should be checked for the pos­ as a variety of R. betularum Hora (Reumaux & sibility of mixed collections. It is not rare to find Moënne­Loccoz 2003). The colours in R. betula- out that the neo­ and epitypes selected from older rum are reminescent of those of R. pyriodora but collections have been mixed collections, even if microscopical features are clearly different. The only two to three fruitbodies are present. For ex­ microscopical features given by Reumaux et al. ample in the case of R. clavipes Vel., the neo­ (1996) for both R. betularum and R. alborosea 24 RUOTSALAINEN & HUHTINEN: RUSSULA PYRIODORA KARSTENIA 51 (2011) demanded type study of the latter species. In the base especially when old. Context thin, fragile, extreme south­western part of Finland one can greyish white, spongy in stem. Taste peculiarly possibly find a taxon of a similar appearance to unpleasant, oily and sweetish, slightly sharp in our new species, namely R. minutula Vel. But it gills but not burning. Odour clear, sweet, pear­ seems that the new species is a well­character­ like, like that of Inocybe corydalina. Spore-print ized, by its odour. The clear odour of pears was almost white, in Romagnesi’s scale I.a(–b), in verified by several mycologists for the whole Dagron’s scale 1(–2). Spores 8.2–9.6(–10.5) × material. (7–)7.2–7.8(–8.2) µm, mean 9.0 × 7.6 µm, mean Q= 1.19, broadly ellipsoid to obovate­ellipsoid; in a squash mount the ornamentation is variable, Materials and methods with warts, groups of warts or short crests, with hardly any connectives, warts mostly rounded, The specimens were studied with Leitz Laborlux 10 and pointed warts rare; in a spore­print, spores are characters drawn using a drawing apparatus. Spores were larger and warts are more spaced, pointed warts observed and measured using × 1250 magnification from preparations made from gills in Melzer’s Reagent (MLZ), rare, up to 1.0 µm high; plage small, partially am­ Q ­values were measured from a spore print. Elements yloid with tiny warts or often only surrounded by of the cap cuticle were studied in water, Congo red (CR) a weakly amyloid zone. Basidia 34–36 × 10–12 and Carbol Fuchsin using × 600 magnification. They are µm, four­spored, short, clavate. Cheilocystidia illustrated from preparations in CR. ca 85 × 8.5–10.0 µm, abundant, fusiform with a long, tapering apex, often with a small appendix, contents bright or minutely granulose (in MLZ). Russula pyriodora Ruots., sp. nova – Cuticle (in CR) with abundant dermatocystidia, Figs. 1, 2, 4 either in small bunches (in Kainuu collections) MycoBank no.: MB563454 and narrowly clavate, 6–8 µm wide, 0–2 ­sep­ tate, exceptionally non­variable; or (in Nilsiä E speciebus aliis Russulorum odore pyri differt. collection) scattered, longer, almost cylindrical – narrowly clavate, rather non­variable. Epicu­ Typus: Finland. Kainuu. Paltamo, Tololanmäki, tis hyphae narrow, 2.0–2.8 µm diam, cylindrical, Kylmänpuro Nature Protection Area, Grid 27 °E the broadest narrowly clavate, septal intervals 713875:355055, 21.VIII.2011 Mauri Lahti & relatively long, contents not granulose. Juhani Ruotsalainen, JR.8415F (KUO – holoty­ pus; TUR – isotypus). Ecology and distribution The new species is a small, apparently rare, look­ alike of Russula betularum, differing in the clear Russula pyriodora has so far been found from pear odour and slightly sharp taste. Cap 1.8–5.5 two sites in Finland. Both Paltamo (Kainuu) cm diam, pale pink or rose colour when young, and Nilsiä (Pohjois­Savo), collection sites were silky glossy, convex, becoming more flattened nutrient­rich brook ravines with some influence and matt when older, with paler patches due to of limestone. The holotype originates from a wet, age and dryness, umbo small and darker, margin wooded mire with a mosaic of tussocks of grasses smooth when young, later moderately but clearly and herb­rich areas. The main tree genus is Betu- sulcate. Lamellae straight, seceding, moderately la, together with Alnus, Salix and Picea (Fig. 3). spaced when young, greyish white when fresh, In Nilsiä the site is dominated with large spruces, becoming yellowish white when more dry, rather together with Betula, Alnus and Salix. It is hard distant when older, greyish white, ochraceous to be sure about the host tree species; most likely grey­white when more dry, lamellulae scanty. it is Betula. On the other hand, the senior author Stem longer than the cap diameter, 4–6 × 0.6– has collected R. betularum from Betula­free plan­ 1.3(–1.8) cm, at first cylindrical to slightly cla­ tations of spruce. However, these sites have not vate, later widest in the middle, widening also at been as moist and nutrient rich as those where R. apex, greyish white or with a red hue, sometimes pyriodora has been found. Demanding species of more clearly rosy red for the whole length, sur­ fungi found nearby include Russula atroglauca face not totally smooth when old, tapering at the Einhell., R. cremeoavellanea Singer, R. nauseosa KARSTENIA 51 (2011) RUOTSALAINEN & HUHTINEN: RUSSULA PYRIODORA 25 (Pers.) Fr., R. olivina Ruots. & Vauras, Inocybe scription and illustrated spores, R. alborosea maculata Boud. and Lactarius olivinus Kytöv. also needed to be taken into account (Reumaux et al. 1996: 69, 74, 105, 122, 281). It has been Paratypi: FINLAND. Pohjois-Savo. Nilsiä, Palokan­ collected under Fagus but the description seems gas, Loutteispuro Nature Protection Area, Grid 27° E 710282:355214, 09.IX.2010 Ruotsalainen, JR. 8291 to point to R. betularum. A study of the isotype (KUO). Kainuu. Paltamo, Tololanmäki, Kylmänpuro revealed spores which are different from those Nature Protection Area (= type locality), Grid 27° E of R. pyriodora but which, on the other hand, 713875:355055, 16.VIII.2010 Ruotsalainen, JR.8128F do not match those illustrated by Reumaux et (KUO). al. (1996: 105) as part of the diagnosis. As the Specimens studied for comparison: (R. alborosea) spores reminded the senior author about R. FRANCE. Ardennes. Bois de Toges, 21.IX.1994 Re- mairei Sing., the microscopical features of the umaux R.63c (G, isotype). – (Russula betularum) FIN- type of R. alborosea re­examined by the senior LAND. Pohjois-Savo. Kuopio, Vehmersalmi, Kulhua, author are given below (cf. also Fig. 6). Spores N of Suurjärvi, Grid 27° E 69525:35511­2, 09.VIII.1989 Ruotsalainen, JR.1394F (KUO). – (R. mairei) SWEDEN. measured 7.8–9.0 × 6.0–6.8 µm and were mostly Småland. Färgaryd, Hyltebryg, Fagus forest, 17.IX.1987 shortly ellipsoid with a small, slightly amyloid Ruotsalainen JR.757 (Herb. JR); Femsjö, SW side of Södra plage. Possibly many of the spores in the type Färgen, Fagus forest, 17.IX.1987 Ruotsalainen JR.763F are not fully mature because the biggest spores (Herb. JR). ITALY. Veneto. Belluno, Trichiana, Col di Pera, Fagus forest, 20.VII.2001 Alpago-Novello, Vauras & have a thinner reticulum compared to that of the Ruotsalainen, JR.5702 (Herb. JR); Melere, Ongia, Fagus smaller, more clearly amyloid spores, that also forest, 30.IX.2002 Ruotsalainen JR.6189 (Herb. JR); Li­ had larger warts. Compared to our material of mana, Valmorel, 27.VII.2006 Alpago-Novello, Vauras & R.
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