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Austroboletus occidentalis
''Austroboletus occidentalis'', commonly known as the ridge-stemmed bolete, is a species of bolete fungus found in Australia. It was described as new to science in 1986 by mycologists Roy Watling and Norma M. Gregory.〔 The species name ''occidentalis'' is derived from the Latin ''occidens'' "west".〔
The fruit body has a 5.5–10 cm diameter cap that has a texture reminiscent of suede or chamois and can be sticky when young. Initially orange- or pinkish-brown, it is subconical with a thickened margin, and flattens with age and fades an ochre colour. Like other boletes, it has tubes under the cap instead of gills. These are white in young specimens maturing to pink. The cylindrical white stipe is 7–16 cm tall and 1.7–2.5 cm wide, marked with deep lacunae.〔 The white flesh bruises yellowish and has a bitter taste. The edibility is unknown. The spore print is brown, the spores 15–19 x 5–6.5 μm and covered entirely with warty lumps.
''Austroboletus occidentalis'' is a component of jarrah (''Eucalyptus marginata'') forests in southwestern Western Australia. It has been found in coastal scrub in southeastern Tasmania.
The presence of ''A. occidentalis'' is associated with increased growth and nutrient uptake in jarrah seedlings, despite the fact that mycorrhizal material was not recovered from the roots of the eucalypt. Chemical and genetic analysis of the soil and plants showed that fungal hyphae were nearby the roots and that plants had increased levels of phosphorus, nitrogen and magnesium, however the mechanism for this is unclear.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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