Boletus hiratsukae

Boletus hiratsukae
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Boletales
Family:	Boletaceae
Genus:	Boletus
Species:	B. hiratsukae
Binomial name
	Boletus hiratsukae; Eiji Nagasawa (1994)

Boletus hiratsukae is a basidiomycete fungus of the genus Boletus found in Japan. Described by Japanese mycologist Eiji Nagasawa in 1994, it is named after Naohide Hiratsuka. It is characterized by a grey-purple then brown pileipellis and a reticulated stem near the hymenium. It is close to Boletus edulis.

Description

B. hiratsukae is identified by a dark brown to sooty color of both the pileus and stipe, a "dry, pruinose-subvelutinous pileus without any rugosity throughout its development," and a "palisade trichodermium structure of pileipellis" where hyphae often form a bead-like structure with short, inflated terminal and sub-terminal cells.[1]

The pileus is 5 to 13 cm in length and is occasionally depressed when old. The stem is purplish gray but turns distinctly dark gray to brown with age.[1] The flesh is white, also when cut, with no distinct smell. The stipe is dark brown, reticulated with white veins towards the top of the stipe.

Related species

Populations of Boletus variipes found east of the Rocky Mountains are sister species to B. hiratsukae, with B. variipes from Central America and southeastern North America sister to the combined lineage.[2] Within the genus Boletus, B. hiratsukae resembles B. aereus and B. variipes Pk. var. fagicola.[1]

Habitat and distribution

B. hiratsukae is rarely solitary and has been known to reside near conifers.[1]

Ecology

Mycorrhizal associations

B. hiratsukae may form mycorrhizal relationships with members of Pinaceae, particularly P. abies and P. pinus.[1]

Radioactive cesium activity

A study investigating the spatial distribution of radiocaesium in wild mushrooms and soil contaminated by the Fukushima accident concluded that the concentration of radiocaesium in B. hiratsukae did not rely on the distance between the mushrooms.[3]

References

Nagasawa, Eiji (1994-01-12). "A New Species of Boletus Sect. Boletus from Japan". Proceedings of the Japan Academy Series B-physical and Biological Sciences - PROC Jpn ACAD B. 70 (1): 10–14. Bibcode:1994PJAB...70...10N. doi:10.2183/pjab.70.10. S2CID 85126916. Retrieved 2023-03-02 – via ResearchGate.
Dentinger, Bryn T.M.; Ammirati, Joseph F.; Both, Ernst E.; Desjardin, Dennis E.; Halling, Roy E.; Henkel, Terry W.; Moreau, Pierre-Arthur; Nagasawa, Eiji; Soytong, Kasem; Taylor, Andy F.; Watling, Roy; Moncalvo, Jean-Marc; McLaughlin, David J. (December 2010). "Molecular phylogenetics of porcini mushrooms (Boletus section Boletus)". Molecular Phylogenetics and Evolution. 57 (3): 1276–1292. doi:10.1016/j.ympev.2010.10.004. ISSN 1055-7903. PMID 20970511. Retrieved 2023-03-02 – via ScienceDirect.
Komatsu, Masabumi; Suzuki, Narimi; Ogawa, Shuta; Ota, Yuko (2020). "Spatial distribution of 137Cs concentrations in mushrooms (Boletus hiratsukae) and their relationship with soil exchangeable cation contents". Journal of Environmental Radioactivity. 222: 106364. doi:10.1016/j.jenvrad.2020.106364. ISSN 0265-931X. PMID 32791375. S2CID 221121231. Retrieved 2023-03-02 – via ScienceDirect.

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[:0-1] Nagasawa, Eiji (1994-01-12). "A New Species of Boletus Sect. Boletus from Japan". Proceedings of the Japan Academy Series B-physical and Biological Sciences - PROC Jpn ACAD B. 70 (1): 10–14. Bibcode:1994PJAB...70...10N. doi:10.2183/pjab.70.10. S2CID 85126916. Retrieved 2023-03-02 – via ResearchGate.

[2] Dentinger, Bryn T.M.; Ammirati, Joseph F.; Both, Ernst E.; Desjardin, Dennis E.; Halling, Roy E.; Henkel, Terry W.; Moreau, Pierre-Arthur; Nagasawa, Eiji; Soytong, Kasem; Taylor, Andy F.; Watling, Roy; Moncalvo, Jean-Marc; McLaughlin, David J. (December 2010). "Molecular phylogenetics of porcini mushrooms (Boletus section Boletus)". Molecular Phylogenetics and Evolution. 57 (3): 1276–1292. doi:10.1016/j.ympev.2010.10.004. ISSN 1055-7903. PMID 20970511. Retrieved 2023-03-02 – via ScienceDirect.

[3] Komatsu, Masabumi; Suzuki, Narimi; Ogawa, Shuta; Ota, Yuko (2020). "Spatial distribution of 137Cs concentrations in mushrooms (Boletus hiratsukae) and their relationship with soil exchangeable cation contents". Journal of Environmental Radioactivity. 222: 106364. doi:10.1016/j.jenvrad.2020.106364. ISSN 0265-931X. PMID 32791375. S2CID 221121231. Retrieved 2023-03-02 – via ScienceDirect.