Pluteus observed in the Mangemangeroa Reserve - Pluteus microspermus

I have observed different variations of this species in the Mangemangeroa Reserve, some with convex, very dark brown fruit bodies and others which tends to be lighter in colour, larger and flatter in appearance. There are no differences in microscopic characters between these observations and DNA sequencing confirms they are both variations of Pluteus microspermus. Sequences for this species do not match Horak’s Pluteus concentricus.

Horak describes the fruit bodies of Pluteus microspermus as similar to those of Pluteus concentricus with the same concentric bulges. The caps are described as large, 60-100 mm.

Description; The cap of this species is brown to dark brown in colour and is convex to flat when mature. There are raised concentric rings or low ridges in concentric rings towards the outer margin of the cap with bumps further in towards the centre. The cap of this species has been observed growing up to 9 cm in diameter. The appearance of the cap is relatively smooth with fibrils lying flat on the cap and there may be some splitting of the cap at the margin. The gills are cream-beige to beige-pink with a darker brown edge. The stipe is brown and fibrous along the entire length with a bulbous base. It may be longitudinally ridged especially towards the base.

Abundance: Frequently observed in the Mangemangeroa Reserve.

Acknowledgement: J.A. Cooper and P.R. Johnston

Posted by codfish codfish, April 22, 2019 03:04

Observations

Photos / Sounds

What

Shields (Genus Pluteus)

Observer

codfish

Date

May 4, 2016

Description

Group of five Pluteus on a fallen log with a dark cap. The cap has the appearance of appressed fibres with two concentric rings around the outer margin of the larger two fruit bodies and bumps further in towards the centre. The cap diameter is 4 to 7.5 cm with a height of 4.5 to 7.5 cm. The gill colour is a light cream-beige with a very dark edge. The stipe has dark fibres over the entire length covering a cream stipe with a bulbous base. The diameter of the stipe is 8-10 mm with a base diameter of 16-20 mm. The spore print colour is beige-pink. The spore size is about 5 x 3.7 micron. Remnant mature coastal broadleaf forest.

Photos / Sounds

Observer

codfish

Date

November 20, 2016

Description

This Pluteus species has a large flat dark brown cap when mature with small low ridges towards the outer margin of the cap. The appearance of the cap is relatively smooth with fibres lying very flat on the cap. There was some splitting of the cap at the margin. This fruit body was 8 cm in diameter with an overall height of 11.5 cm. The gills have a darker brown edge. The stipe is brown and fibrous along the entire length. It was longitudinally ridged especially towards the base and quite fuzzy towards the apex. The stipe was tall, 10-11 mm in diameter with a bulbous base of about 25 mm diameter. It was observed growing amongst disintegrated very rotten wood on the ground. Remnant mature coastal broadleaf forest.

Photos / Sounds

Observer

codfish

Date

November 27, 2016

Description

This Pluteus species has a large flat brown cap with small low ridges towards the outer margin of the cap. The appearance of the cap is relatively smooth with fibres lying very flat on the cap. There was some splitting of the cap at the margin. This fruit body was 9 cm in diameter with an overall height of 6 cm. The gills have a darker brown edge. The stipe is brown and fibrous along the entire length. The stipe was 9 mm in diameter with a bulbous base of about 22 mm diameter. It was observed growing on a fallen rotting branch. Remnant mature coastal broadleaf forest.

Photos / Sounds

Observer

codfish

Date

January 6, 2018 11:45 AM NZDT

Description

Growing on the ground under lots of scattered small fallen branches. These fruit bodies were about 6-7 cm in diameter and 6 cm in height and were probably not fully expanded. Remnant mature coastal broadleaf forest.

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