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A Propos Du Complexe Postia Sericeomollis

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A Propos Du Complexe Postia Sericeomollis Tome 75 Fascicule 3 Mars 2006 Bulletin mensuel dela DE LYON te linneenne de Lyon, reconnue d'utilità publique, fondéen 1822 33, rue Bossuet F-69006 LYON 1 Numérisatio Sociétlinnéenn de Lyon - 113- Bull. mens. Soc. linn. Lyon, 2006,75 (3) : 113-133 A propos du complexe Postia sericeomollis Max Pieri* et Bernard Rivoire** * 76 avenue de la Synagogue, F-84000 Avignon - [email protected] '27 route de Jalloussieux, F-69530 Orliéna- [email protected] RésumÃ- Les auteurs ont examinÃle lectotype de Polyporus sericeomollis Romell et pro- posent de nommer Postia romellii sp. nov. les récolteconsidér6e comme Postia sericeomollis par certains auteurs et qui different du lectotype. Ils publient égalemenPostia davidae pour des spécimenméridionnau dont les caractèremicroscopiques different des deux espèce précà dentes. Ils présentenune clÃdes Postia sensu lato à cystides, dressent et commentent la liste des Postia à mitospores. Mots-clés- Basidiomycota, polypore, Europe, Postia sericeomollis, Postia romellii, Postia davidae, mitospores. About the Postia sericeomollis complex (Polyporales, Fomitopsidae) Summary. - The authors have examined the Romell lectotype of Polyporus sericeomollis and suggest to name Postia romellii sp. nov. the crops regarded as Postia sericeomollis by other authors, but which differ from the lectotype. They also publish the type of Postia davidae sp. nov. for southem specimens that differ from the two aforesaid types by their microscopic size. They present a key to Postia sensu lato with cystidia and they draw up and comment on the list of Postia with mitospores. Keywords. - Basidiomycota, polypore, Europa, Postia sericeomollis, Postia romellii, Postia davidae, mitospores. HISTORIQUE Polyporus sericeomollis a étpublià par ROMELL(191 1 : 22) mais, dans sa des- cription originale, l'auteur ne mentionne pas la présencde cystides, bien que celles-ci soient l'un des élémencaractéristiqu de l'espèce LOWE(1958 : 107) a étudiles récoltede Romell et note, en se référaà la récoltRomell Nattavara du 7.9.1910 (LOWE,1966 : 85) : à The type of Polyporus sericemollis has very abundant cystidia. By some mischance Romell did not mention them in his original description, nor did he correct this omission in later writings. à ROMELL(op. cit.) indique cependant que cer- taines de ses récolteprésenten des amas pulvérulentde couleur pâlà jaune soufre, constituéde rnitospores ovoïdeà ellipsoïdales-d5-7,7 x 4-5 Pm. ROMELL(1926 : 17) admet que les amas pulvérulentjaunes correspondent à Ptychogaster citrinus Boud., anamorphe de Postia rennyi (Berk. & Broome) Rajchenb. Il semble donc, comme le suppose DONK(1 97 1 : 2 10 ; 1974 : 1IO), que ROMELL(19 1 1) ait décriPolyporus seri- ceomollis à partir de récoltecorrespondant à Postia sericeomollis dans son acceptation actuelle et à Postia rennyi. POUZAR(1967 : 206), DONK(1974 : 1 IO), DAVID& LECOT (1990 : 74), notent que cette confusion a conduit BOURDOT& GALZIN(1925, no 571 ; 1928, no 842), à décrirPostia rennyi sous l'épithèLeptoporus sericeomollis. PILAT AcceptÃpour publication le 16janvier 2006 NumérisatioSociét linnéenn de Lyon sur BOURDOT& GALZIN(op. cit.) ont commis cette mêm erreur. ROMELL(1912 : 642) décriet figure à nouveau Polyporus sericeomollis mais mentionne des spores allantoïdede 3-4 x 1,5-2 Pm. Dans un article postérieur ROMELL(1926 : 17) considèrque les récolteà spores allantoïdene correspondent pas à Polyporus sericeomollis et nomme alors cette espèc Polyporus subsericeomollis. KOTLABA& POUZAR(1964 : 217) suivis de DONK(1972 : 176), pensent que Polyporus whcorinonrnniiiv Rnmpll pet nn cvnnnvmfa de Pnvtin flnrifnrmiv (On41 ) Tiilich 1.o~ "W"",,, *.,"",,*"""V" A."...--. vu. ...A -,-.-.AJ---- -- - "-.-J-..,--- ,x---.," - (1966 : 74) considèrque Polyporus subsericeomollis, à spores allantoïdeet présentan des cystides incrustéede cristaux au sommet, doit êtr nommÃPostia simanii (Pilit) Jülichmais cette espèc possèd des spores de 0,8-1,2 pm d'épaisseurRYVARDEN (1974 : 28 1) considèrque l'espèc de Romell correspond à Postia hibemica (Berk. & Broome) Jülich Leptoporus litschaueri Pilit (PILAT, 1932 : 9, fig. 2, pl. 8, fig. 1) rebaptisà Leptoporus asiaticus par PILAT (1936 : 194, fig. 92) est, d'aprè LOWE(1958 : 101, 107), .-. A- Dan+;- B,.-;aaa-nll;n V-T AT>A Sr D~TTVA~/Â¥IO<; . 7<;\on-&-, point de vue. LOWE(1966 : 84) note égalemenque Tyromyces sublacteus cré pai CHRISTIANSEN(1960 : 359) n'est autre que Postia sericeomollis. LE COMPLEXE POSTIA SERICEOMOLLIS ROMELL(191 l) décriPolyporus sericeomollis à partir de récolteprovenant d'une ....A A- \T..+b.......... ...* A3....+..,. ......+ Ar." ,.-.,:--.--A- C+fi,.lA.-1- c'..Li* T .. A,....-A-+:fi.. nA UCULuc lwwavuCL u auuc UCUL UC'S CIIVL~UII~uc JLULNIU~III, JUCUC. J-È UC~L-~LUUUIImi- ginale s'appuie sur un ensemble de cinq récolteque nous avons examinée: - no F44915 correspond à Trechispora mollusca (Pers. : Fr.) Liberta, mélangà Postia rennyi ; - no F16052 et no 16053 sont des spécimende Postia rennyi ; - no F16050, récoltÃle 7.9.1910 à Nattavara, est désignÃcomme lectotype de Polyporus sericeomollis Romell par RYVARDEN(1974 : 281) ; - no 13752F16051, récoltÃle 25.12.1908 dans les environs de Stockholm, dif- fèr du lectotype de Polyporus sericeomollis par la forme et la taille des cystides et par l'épaisseude la paroi des hyphes de la chair et de la trame. Ce spécimecorrespond à notre conception de Postia sericeomollis ainsi qu'à celle de JAHN(1970-1971 : 49, Gm n) cemhle-t-il 1 ec ~orootAroc&rnnxq& nnnlc- nqr~iocnnton#oontc nnlm- or&r nnn nouvelle espèc : Postia romellii. Postia sericeomollis ne semble pas posséded'anamorphe accompagnant les basi- diomes (POUZAR,1967 :208 ; DOMANSKI,1972 :53 ;JAHN, 1970 : 15) mais des mitospo- res ont étobservée en culture (NOBLES,1948 : 308,385 ; 1958 : 897 ; 1965 : 1119 ; sieurs - 116- abondantes, largement- fusiformes, ventrues, de 15-25 x 6-15 pm, à paroi épaissià trè épaisseparfois à lumen trè étroitsommet incrustÃou non de cristaux, racine souvent bifide, issue de la couche hyménialeLOWE (1966 : 85, fie. 66), figure les cystides du plus ou moins ramifiéesHyphes de la chair, de 3-5 pm de diamètreà paroi épaisse voire sans lumen. Hyphes de la trame, de 2,5-4 (4,5) pm de diamètreà paroi épaisse voire à lumen étroitquelques-unes à paroi mince. Les hyphes plus ou moins redressée de la face substratale présentenpour la plupart une extrémitampullacé légèreme amyloïdeLes hyphes gonflent un peu dans la potasse, notamment celles de la chair. Nous avons observÃdans les spécimenno LYAD1055 et no BR2417 des élémen --.-Â¥-.-1- -1- 9 O^ ^ 9^ .. '^ A^ 'à AA ,,- "..-;rt/-inÈ-È*. 0 /lacmitnC'TM-•rf Â¥ UVUlUCìUC J,OUÑU,J A L,'+LÑJ, plll, qui p~ulicm-'iitbuii^apwii~~~.~_- u. uuo ~LLWU~WLWU.-- présencd'un anamorphe dans le basidiome reste cependant à confirmer. Habitat :saprophyte des bois de résineuxcità sur Picea obovata, Larix sibirica, Pinus sibirica (PILAT 1936 : 194), Picea abies (NIEMELA,comrn. pers.). Distribution : Postia sericeomollis semble localisà en Eurasie septentrionale : @..S.J- /-.Ln.-1+L D.-i.-nll\ iZÈ,lny./l/'MiomalH\ CihAAa nppiAontnlo pt CihfìMfpfan+r"~l(a espèc semble absente de la fonge de France à ce jour. Matérieétudi :herbier du muséubotanique de Stockholm : lectotype herbier de Romell no F16050, sur résineuxNattavara, Suède7.9.1910. Herbier A. David : LYAD1055, récoltpar Lowe, no 6412, sur résineuxle - - ---L - -- -- - --- 2. -7 . - --.- ,-a ,.-, 24.9.1955, Etat de New-York, Warensburg, fctats-Ums ; LYAlJ ou, sans rererence. Herbier B. Rivoire : no BR2417, récoltpar Niemela, sur Picea abies, Lammi, Evo, Finlande, 17.9.1992. Postia romellii M. Pieri & B. Rivoire, sp. nov. Étymologi: en hommage au mycologue Lars Romell. Diagnose originale Postia romellii a Postia sericeomollis (Romell) Jiilich differt cystidiis raris vel lnnnt:- m,-ããr.ã~t;h,..,,~;.,^v~t;~ n~r,,,mtÃfilfi~.-lfw;h~,~ 7run v 2-5 <'A'\ lim ~I~JC' LL/L>L<Ll//t plMCJC/LLtI/WJà LyI-l/tMfMtt-0 LAftgWJtC. J1-lJyt./rr•H-L/M A-V/ -TV/ \ww/ *-à d d \wf y", ^/""Vu minusve crasse tunicatis et cum apice crystallis incrustato ;camis tramaeque hyphae crasse tunicatae, nonnullae hyphae lignum contingentes cum digitaliformibus extube- Macroscopie Basidiome apiléÃrésupinà en bande étalÃet appliquéau support, jusqu'à 90 mm de longueur, 15 mm de largeur et 1,5 mm d'épaisseurfibreux, blanc crème Marge à contour sinueux, bande stérilsubnulle, localement jusqu'à 3 mm de large, à terminaison amincie, fibrilleuse, cotonneuse par endroits, appriméeparfois faiblement soulevéeFace en contact avec le support fibrilleuse à villeuse. Hyménophorporé blanc crème3-4 pores par mm, réguliersarrondis ou anguleux, arête obtuses, fim- briéesTubes à une seule couche, jusqu'à 1,4 mm de hauteur, trame fibreuse. Chair trè mince, jusqu'à 0,2 mm d'épaisseurhomogène fibreuse, lâcheconcolore à l'hyméno phore. Microscopie Spores ovoïdesde 3,874,4494 x 2,05-2,3-2,46 Pm, Q : 1,9 (n = 30, spores mesuréedans le rouge Congo ammoniacal), à paroi épaissiecyanophile, non amyloï de. Basides largement cylindriformes, de 15-20 x 5-7 Pm, la plupart étrangléà mi- hauteur, tétrasporiquesC~stides présente par endroits seulement et peu nombreuses, cylindriformes à étroitemenfusiformes, de 20-40 (60) x 3-5 (6) Pm, à paroi épaissià épaisset sommet incrustÃde cristaux. Systèmhyphique monomitique à hyphes génà ratrices boucléesentremêlée plus ou moins ramifiéesà paroi épaissiequelques-unes à paroi épaisset à lumen discontinu.
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