First report of a subhypogeous basidiomycete, Scleroderma yunnanense (Boletales) from Japan
半地下生担子菌Scleroderma yunnanense （シラガニセショウロ， イグチ目） の日本初記録

Article info

Taiga Kasuya, Kazumasa Imai, Kentaro Hosaka (2023) Truffology 6(1): 1–6
Submitted: 29 December 2022
Accepted: 17 March 2023
Published: 31 July 2023

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Abstract

A subhypogeous sclerodermataceous fungus was collected in Nagoya, Aichi Prefecture, central Japan. Based on morphological observations and phylogenetic analyses using nuclear ribosomal DNA sequences, the present fungus was identified as Scleroderma yunnanense, belonging to Sclerodermataceae (Boletales). Scleroderma yunnanense is new to Japan and characterized by not stellately dehiscent basidiomata when mature, thick (2–7 mm) peridium covered by cream to pale yellowish scales, basidiomata covered with whitish mycelial strands, clamped hyphae, and globose to subglobose basidiospores densely covered with pyramidal warts.

要旨

愛知県名古屋市において、ニセショウロ型の半地下生菌の一種が採集された。本菌について、形態的特徴の観察および子実体より得られた核リボソームDNA の塩基配列 を用いた系統解析を行った。その結果、本菌はイグチ目ニセショウロ科に属するScleroderma yunnanense と同定された。本種は日本新産であり、子実体が成熟しても星形に裂開しない点、殻皮が厚く（2–7 mm）、クリーム色～淡黄色を帯びる鱗片に覆われる点、子実体の表面に白色の菌糸束が存在する点、菌糸にクランプ結合を有する点、そして担子胞子が球形～類球形で角錐状のいぼ状突起により密に覆われる点で特徴づけられる。本菌の和名をシラガニセショウロとする。

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