Pluteus romellii (Britzelm.) Sacc. - Goldleaf Shield

Pluteus romellii

Phylum: Basidiomycota - Class: Agaricomycetes - Order: Agaricales - Family: Pluteaceae

Pluteus romellii is a distinctive wood-rotting fungus of broadleaf (hardwood) and mixed woodlands.

Distribution

In Britain this rather uncommon fungus is found throughout England, Wales and Scotland; it is also found in Ireland.The Goldleaf Shield is also found in many parts of mainland Europe.

Taxonomic history

Pluteus romellii on woodchipThe basionym of this species was established when the Goldleaf Shield was described in 1891 by German mycologist Max Britzelmayr (1839 - 1909), who gave it the name Agaricus romellii. It was Italian mycologist Pier Andrea Saccardo who, in 1895, transferred this species to the genus Pluteus, whereupon its scientific name became Pluteus romellii.

Synonyms of Pluteus romellii include Agaricus romellii ;Britzelm., Agaricus nanus var. lutescens Fr., Pluteus nanus var. lutescens (Fr.) P. Karst., Pluteus lutescens (Fr.) Bres., and Pluteus splendidus A. Pearson.

Etymology

Pluteus, the genus name, comes from Latin and literally means a protective fence or screen - a shield for example! The specific epithet romellii honours Swedish mycologist Lars Rommel (.1854 - 1927), one-time associate editor of Mycologia.

Identification guide

Cap of Pluteus romellii

Cap

Smooth near the rim but often wrinkled towards the centre, dark cinnamon brown in the centre but often more yellow towards the margin, initially convex and usually flattening with a low broad umbo, the caps are 1.5 - to 5cm in diameter.

The thin cap flesh is translucent white and firm.

Gills of Pluteus romellii

Gills

White or yellow at first, becoming pinkish yellow, the gills are broad, crowded and free.

Stem

Lemon yellow, but more chrome yellow towards the base, often broadening at base; longitudinally striate; 2 to 6mm in diameter and 2 to 7cm long. The stem flesh is yellow.

Pluteus romellii, gill-edge cystidia

Pleurocystidia

Gill-face cystidia are thin walled and vary in shape from broadly vesiculose (left) to clavate or cylindrical; not ornamented with horns

Cheilocystidia

Gill-edge cystidia are similar to the pleurocystidia..

Spores of Pluteus romellii

Spores

Broadly ellipsoidal, smooth, typically 6.5 x 5.5µm.

Show larger image

Spore print

Pink.

Odour/taste

Not distinctive.

Habitat & Ecological role

Saprobic, usually solitary on well-rotted long-dead stumps, buried rotting fallen branches, sawdust, wood chips,and other woody debris of broadleaf trees, particularly beech, ash and occasionaly blackthorn and elder.

Season

Fruiting from early summer to late autumn, provided the weather is mild. Most often fruiting from mid summer to mid autumn.

Similar species

Pluteus umbrosus has a darker brown wrinkled cap and is generally a little smaller.

Pluteus cervinus has a smooth brown or fawn cap.

Mature Pluteus romellii on woodchip

Culinary Notes

The Goldleaf Shield mushroom Pluteus romellii is reported to be edible but caution is advisable, especially if you have any doubts about identification, because some fungi in the genus Pluteus contain the toxin Psilocybin.

Reference Sources

Alfredo Justo, Andrew M. Minnis, Stefano Ghignone, Nelson Menolli Jr., Marina Capelari, Olivia Rodríguez, Ekaterina Malysheva, Marco Contu, Alfredo Vizzini (2011). 'Species recognition in Pluteus and Volvopluteus (Pluteaceae, Agaricales): morphology, geography and phylogeny'. Mycological Progress 10 (4): 453–479.

Orton, P.D. (1986). British Fungus Flora: Agarics and Boleti. Vol 4. Pluteaceae: Pluteus & Volvariella. Royal Botanic Garden: Edinburgh, Scotland.

Funga Nordica, Henning Knudsen and Jan Vesterholt, 2008.

BMS List of English Names for Fungi

Dictionary of the Fungi; Paul M. Kirk, Paul F. Cannon, David W. Minter and J. A. Stalpers; CABI, 2008

Taxonomic history and synonym information on these pages is drawn from many sources but in particular from the British Mycological Society's GB Checklist of Fungi and (for basidiomycetes) on Kew's Checklist of the British & Irish Basidiomycota.

Acknowledgement

This page includes pictures kindly contributed by Simon Harding and Zoran Bovovic.

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