Laetiporus sp. 1

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Laetiporus sp. 1

This is being described as a new species of Laetiporus.

Basidiocarps annual, laterally substipitate to sessile, imbricate, sometimes occurring in large imbricate clusters up to 50 cm or more extent; pileus dimidiate to flabelliform, up to 24 cm wide and 32 cm long, upper surface light orange to reddish orange when fresh, fading to pale brownish with age or drying, glabrous, azonate to faintly zonate, radiately furrowed, when fresh; pore surface cream to pale cream, pores nearly circular at first, becoming more angular in age, 2-4 per mm, with thin dissepiments that quickly become lacerate; tube layer pale yellowish white when fresh, drying pale buff, distinct, up to 3 mm thick; context white to yellowish white, azonate, brittle and sappy or succulent when fresh, up to 3cm thick, rapidly becoming crumbly and white in old deteriorating specimens; taste mild, smell like garbage, unpleasant. Hyphal system dimitic; contextual generative hyphae thin-walled, hyaline, simple-septate, with rare branching, 4.6-15 µm in diam.; contextual binding hyphae firm- to thick-walled, hyaline, nonseptate, much branched and interlocking, up to 22 µm in diam.; tramal generative hyphae thin-walled, hyaline simple-septate, 2.4-3.6µm in diam.; tramal skeletal hyphae thick- to firm-walled, 2.4-4.4 µm in diam. Cystidia or other sterile hymenial elements lacking. Basidia clavate, 2-4 sterigmate, (tubular), 15-20 × 5-8 µm, simple-septate at the base. Basidiospores ovoid to ellipsoid, hyaline, smooth, IKI-, CB-, (4.9-) 5.6-7 (-8.3)×(3.1-)3.9-4.7(-5) µm, L = 6.3µm, W = 4.4µm, r = 1.43, R = 1.29-1.63.

  • Substrata: hardwoods, most frequent on Quercus spp. and Prunus spp. , sometimes on conifers such as Taxus spp. and Pinus sp., occurring on dead logs, stumps, frequently near the base of living large trees, up to only 1-1.5 m above ground level.
  • Distribution: in the cool temperate to boreal areas in Japan and China.
  • Type of decay: brown rot, butt rot and heart rot
  • DNA sequences(nuclear ribosomal DNA of ITS1, 5.8S and ITS2): AB308164[[1]], AB308165[[2]], AB308176[[3]], AB308177[[4]], AB308178[[5]], AB308179]], AB308182[[6]], AB308183[[7]]
  • DNA sequences (elongation factor 1 α region partial): AB308242[[8]], AB308251[[9]], AB308252[[10]], AB308253[[11]], AB308254[[12]], AB308256[[13]], AB308257[[14]]


Laetiporus sp. 1

子実体は1年生、無柄あるいは側生の短い柄を持つ。共通の基部から複数の傘が重なり合って発生し、ひと株が50cmをこえる大きな子実体となる場合もある。は扇型から貝殻型、長さ32cm幅24cm、傘の表面は新鮮時は鮮やかなオレンジ色から赤みを帯びたオレンジ色、のちに色あせて淡褐色になる。放射状に波打つ。不明瞭な環紋がある。子実層托は菅孔状、クリーム色から白っぽいクリーム色、孔口は円形、のちにやや角型。2-4個/mm、菅孔は生時は淡黄白色、古くなると淡黄褐色、菅孔の長さ3mm以下。傘肉は類白色から淡黄白色、厚さ3cm余り、新鮮時は多湿柔軟でもろい肉質、古くなり乾燥するともろく砕けやすくなる。ごみのような不快臭をもつ。 子実体組織の菌糸型は2菌糸型:傘肉の原菌糸は無色、薄壁、クランプを欠く、ほとんど分岐しない、径4.6-15 µm。結合菌糸は厚壁、無色、隔壁はなく、頻繁に分岐し結合する。径22 µm。実質組織の原菌糸は薄壁、無色、クランプを欠く、径 2.4-3.6 µm。骨格菌糸は厚壁、無色2.4-4.4 µm。担子器は2-4小柄、大きさ15-20 × 5-8 µm 基部にクランプを欠く。担子胞子は楕円形~卵形、無色、平滑、IKI-, CB-, (4.9-) 5.6-7 (-8.3)×(3.1-)3.9-4.7(-5) µm, L = 6.3µm, W = 4.4µm, r = 1.43, R = 1.29-1.63。

  • 基質および宿主:広葉樹。宿主として最も多いのはコナラ属、サクラ属。針葉樹(イチイ属、アカマツ)からも発生する。切株、倒木、時には生きた広葉樹(大径木)の根元部分や地上1.5m程度の高さまで発生する。
  • 分布:冷温帯から亜寒帯地域。日本、中国。
  • 腐朽型・腐朽部位:褐色腐朽、根株腐朽、心材腐朽