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On Fennoscandian Polypores 7. the Genus Pycnoporellus

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On Fennoscandian Polypores 7. the Genus Pycnoporellus Karstenia 20: 1-15. 1980 On Fennoscandian polypores 7. The genus Pycnoporellus TUOMO NIEMELA NIEMELA, T. 1980: On Fennoscandian polypores 7. The genus Pycnoporellus. - Karstenia 20: 1-15. Descriptions are given of the two species of Pycnoporellus occurring in Fennoscandia, P. alboluteus (Ell. & Ev.) Kotl. & Pouz. and P. fulgens (Fr.) Donk. Their distributions in North Europe are mapped, and their world distributions reviewed. Their ecology, phenology, host relationships, and cultural and microscopical characters are discussed. Great variability exists in the microscopical characters of both species. P. alboluteus is very rare in North Europe, where it has been recorded from only two localities in northern Finland, on Picea abies and once on Alnus incana. P. fulgens is rare and south-eastern in distribution, being known from four Swedish localities and several localities in southern Finland and the adjacent U.S.S.R., mostly on Picea abies, but also on Pinus sylvestris, Populus tremula and Betula. Study of the types indicates that the names frpex woronowii Bres. and Lenzites sepiaria var. dentifera Peck are synonymous with P. alboluteus, and that Ochroporus lithuanicus BYonski (type selected), Polyporus aurantiacus Peck and P. fibrillosus Karst. are synonymous with P. fulgens. The taxonomic position of the genus Pycnopore/lus is discussed. Tuomo Niemela, Department of Botany, University of Helsinki, Unioninkatu 44, SF - 00170 Helsinki 17, Finland. Introduction Materials and methods The genus Pycnoporellus Murrill comprises two The descriptions are based on the specimens deposited in the species in Europe, both rather rare inhabitants of old herbaria GB, H, HFR, OULU, S, TUR, UPS, and the spruce-dominated forests. The existence of P. collections of Heikki Kotiranta (H.K .) and Tuomo Niemela (T.N.). Types were obtained from NY and NYS, as well. alboluteus (Ell. & Ev.) Kotl. & Pouz. in Europe was The procedures followed in measuring the structural details, established relatively lately (Pilat 1936-1942), and it and collecting the other data were the same as in my was reported from northern Europe only ten years previous papers in the series on the Fennoscandian ago (Hintikka 1970). P. fulgens (Fr.) Donk has been polypores. However, the measurements and drawings were made from microscopical sections mounted in 5 O!o KOH. known from Europe since the time of Elias Fries, but The illustrations are my own, and the photographs its distribution in North Europe has not been represent fresh specimens. surveyed before. The cultural characters were studied on malt agar. The The microscopical characters show that the two strains are kept in the collection of the author, and deposited at H . species form a good genus. However, the situation of Pycnoporellus in the classification of the polypores is not yet clearly fixed, even at the family level. Some Pycnoporellus noteworthy studies have been made of the genus and its taxonomy (especially by Kotlaba & Pouzar 1963) . The originally monotypic genus Pycnoporellus was In this paper an attempt has been made to compile described by Murrill (1905) with the generic type P. the information contained by these studies and fibrillosus (P. julgens). The genus Aurantiporellus supplement it with the results of my own Murr. was described at the same time, . with A. investigations and field observations. alboluteus as its type and only species, but was later 2 T. Niemela made a synonym of Pycnoporel/us by Kotlaba and different degree of hypha! specialization. The genus Pouzar (1963). Pycnoporel/us is a good example of the difficulties The species of the genus are characterized by a encountered in the gross taxonomy of the polypores. monomitic hypha! system, clampless septa in the In the definition of the families and other groups, hyphae, narrowly ellipsoid spores with no reactions in consideration should be given to all the characters, Melzer's reagent or Cotton Blue, and prominent including the enzyme systems and nuclear characters, tubular cystidioles in the hymenium. The hyphae are and undue reliance should not be placed on some thin-walled in young fruit bodies, but become single features, such the hypha! systems, or the sclerified towards the end of growth, and stain red in cyanophily of the spores. KOH, especially in the old stage. The fruit bodies are annual or survive to the beginning of the next growing season. Pycnoporellus alboluteus The situation of the genus has been much Fornes alboluteus Ellis & Everhart, Proc. Acad. Nat. Sci . discussed. Many authors stress the similarities with Philadelphia 1895: 413 . 1895. Holotype: Fornes alboluteus the genus Phaeolus: the monomitic hypha! system, E. & E., (U.S.A.,) Mountains of Colorado, on charred the lack of clamp connections, and the presence of trunks of Abiessubalpina (=A. lasiocarpa), 10 000 ft alt., long, thin-walled cystidioles. Pycnoporel/us and July 1894 C.S. Crandall 50 (NY). - Aurantiporellus Phaeolus do seem to be allied genera, but are clearly alboluteus (Ell. & Everh.) Murrill, Bull. Torrey Bot. Club 32: 486. 1905 . - Pvcnoporel/us alboluteus (Ell . & Everh.) separated by their enzymes (David 1969) and Kotlaba & Pouzar, ·ceskil Mykologie 17 : 174. 1963 . pigments (Parmasto & Parmasto 1979). Phaeolus, Lenzi res sepiaria (Fr.) Fr. var. dentifera Peck, N.Y. State and also Pycnoporellus (Pegler 1973) have sometimes Mus. Ann. Rep. 40: 75 . 1887. Holotype: Lenzites sepiaria been considered to belong to the family Fr. var. dentifera Fr., (U .S.A., New York,) Adirondack Mts., on spruce, C.H. Peck (NYS) . Hymenochaetaceae, an opinion which I do not share. lrpex woronowii Bresadola, Ann. Mycol. 18: 42 . 1920. The microscopical characters (especially the hymenial Holotype: lrpex(?) woronowii Bres., (U.S.S.R., Georgian differences) and different enzyme systems, pigments S.S.R.,) Abkhazia, Jugum Bekil-Bgallara, ad truncum and colour reactions separate these genera distinctly fagineum, I. VIII.l912 G. Woronow 260 (S) . Further combinations listed by Donk (1974) . from lnonotus, Onnia, Phellinus and the other representatives of the Hymenochaetaceae. Fruit body annual or persisting to the next spring. A genus which may be quite close to Pycnoporellus Consistency in young fruit bodies elastic in fresh is Laetiporus. The latter is regarded as dimitic material and brittle in dry, in mature stage soft corky (amphimitic), having clampless generative hyphae and not changing much when drying. Taste mild. and sclerified binding hyphae. The structure of the Resupinate, seldom indistinctly effused-reflexed context or subiculum in Pycnoporellus, though with false pilei. Effused parts very variable in size, monomlttc, shows similar differentiation into mostly 2-10 x 5-40 em, on big tree trunks even elongated, rarely branched hyphae and thinner, 0.5-2 metres long; 5-13 mm thick (Fig. 1). Margin ramified branches, which resemble the binding of effused fruit bodies entire or lacunose, without hyphae of Laetiporus. well-delimited sterile zone. False pilei irregular, The separation of generative, skeletal and binding pendent with laterally open tubes (Fig. 3), or formed hyphae in the microscopical structure of by agglomerations of radially oriented, malformed Aphyllophorales was an important innovation and is tubes (Figs. 2, 4), nodular, ruff-like, ca. 1-2 x 2.5 a useful tool for taxonomy. But in my opinion this em, projecting 1-2 em from substrate, without division has sometimes been followed too rigorously. distinct context or differentiated upper surface. Examples of cases which do not fit into the triple Pores on the upper surface and margin of false pilei division are Dichomitus with 'arboriform skeletal coarse, irregular and becoming lacunose and finally hyphae' (Reid 1965) and ?he/linus with distinctly foliose. Pores on the effused parts coarse, angular, septate skeletoid hyphae. The subsolid, ramified side irregular, 3-7 (-9) per em, later fusing together and branches in the hyphae of e.g. Tyromyces lowei are becoming very large and sinuose; mouths dentate also difficult to classify according to this system: from the beginning, finally lacerate. Tubes finally Lowe ( 1975) treats the species as dimitic with binding 0.5-2 em long. Subiculum very thin, 0.5-1 (-3) hyphae, while many others (e .g. Ryvarden 1978) mm in thickness. regard it as monomitic. Overall colour at first pale y~llowish or orange­ Therefore the amphimitic structure of Laetiporus yellowish, in mature stage from orange and salmon to vs. the monomiticity of Pycnoporellus may not be a apricot, weathered fruit bodies pale greyish apricot very fundamental difference, though showing a and finally darkening to light brick red. Colours Karstenia 20. 1980 3 Figs. 1-5. Pycnoporellus alboluteus. - I: Part of a mature fruit body (Poland, Biarowiei:a, Picea abies, 1969 Niemelil344, x 1). - 2: Young, ruff-like nodules on the upper side of partly decorticated trunk (Finland, Pisavaara, P. abies, 1979 Niemelil 1551 & Kotiranta, x 0.8) . - 3: Pendent false pilei (1979 Niemelill551 & Kotiranta, x 0.8).- 4: Fruit body on Alnus incana (Pisavaara, 1979 Niemelil 1543 & Kotiranta, x 1.7).- 5: Fructification emerging in a stored culture (strain Niemelil 1551 & Kotiranta, malt agar, kept at + 5°C, for half a year). 4 T. Niemela Fig. 6. Pycnoporellus alboluteus. a) spores, b) hyphae from subiculum, c) cystidioles, d) dissepiment in vertical section (specimen Niemela 1552 & Kotiranta, T.N.). darker and more intense deep in the tube cavities. Subhymenium 20- 40 J.tm, not well delimited, Bruised parts (e.g. tube mouths)
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