''Suillus subacerbus'' is a species of

bolete {{refimprove, date=July 2020 A bolete is a type of mushroom, or fungal fruiting body. It can be identified thanks to a unique mushroom cap. The cap is clearly different from the stem. On the underside of the cap there is usually a spongy su ...

fungus in the family

Suillaceae The Suillaceae are a family of fungi in the order Boletales (suborder Suillineae), containing the boletus-like '' Suillus'', the small truffle-like ''Truncocolumella'', as well as the monotypic genus ''Psiloboletinus''. As of 2008, there are ...

. Described as new to science in 1968 by mycologist

Robert Francis Ross McNabb Robert Francis Ross McNabb (11 December 1934 – 14 December 1972) was a New Zealand mycologist. He was born in Kawakawa, and attended local schools in his youth, including Whangarei Boys' High School and Southland Boys' High School. He received a ...

, it is found in New Zealand, where it grows in association with ''

Pinus radiata ''Pinus radiata'' (syn. ''Pinus insignis''), the Monterey pine, insignis pine or radiata pine, is a species of pine native to the Central Coast of California and Mexico ( Guadalupe Island and Cedros island). It is an evergreen conifer in the ...

''.

Description

Its fruitbodies produce convex to flattened

caps Caps are flat headgear. Caps or CAPS may also refer to: Science and technology Computing * CESG Assisted Products Service, provided by the U.K. Government Communications Headquarters * Composite Application Platform Suite, by Java Caps, a Ja ...

measuring in diameter. The cap colour is quite variable, ranging from creamy yellow to olive grey initially, later becoming ochre, brown, or reddish orange (sometimes streaked) as the fruitbody matures. The pore surface on the cap underside is dull yellow, later becoming darker. Pores are small and angular, about 0.75–1 mm in diameter. The stipe measures long by up to wide, and lacks a

ring Ring may refer to: * Ring (jewellery), a round band, usually made of metal, worn as ornamental jewelry * To make a sound with a bell, and the sound made by a bell :(hence) to initiate a telephone connection Arts, entertainment and media Film and ...

. The

spore print 300px, Making a spore print of the mushroom ''Volvariella volvacea'' shown in composite: (photo lower half) mushroom cap laid on white and dark paper; (photo upper half) cap removed after 24 hours showing pinkish-tan spore print. A 3.5-centimeter ...

is yellowish brown.

Spores In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, ...

are smooth elliptical, with typical dimensions of 7.8–9.1 by 3.0–3.6

µm The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Uni ...

. The complex of species that include ''

Suillus granulatus ''Suillus granulatus'' is a pored mushroom of the genus ''Suillus'' in the family Suillaceae. It is similar to the related '' S. luteus'', but can be distinguished by its ringless stalk. Like ''S. luteus'', it is an edible mushroom th ...

'', '' S. pungens'', and '' S. acerbus'' appear to be closely related. McNabb suggests that ''Suillus subacerbus'' is "probably of North American origin".

References

External links

subacerbus Fungi described in 1968 Fungi of New Zealand {{Boletales-stub