Albatrellus ovinus (Schaeff.) Murrill - Forest Lamb

Phylum: Basidiomycota - Class: Agaricomycetes - Order: Russulales - Family: Albatrellaceae

Albatrellus ovinus

Seen from above these creamy white or grey-brown polypores, not known to be in Britain but common in some European countries, could be mistaken for Wood Hedgehogs, Hydnum repandum. Often, however, the caps are so distorted that they look more like crumpled paper bags. In the past this unusual mushroom was referred to as the Sheep Polypore; continuing the tradition its new English name is Forest Lamb. A shepherd with very poor eyesight might possibly mistake them for sheep a long way off.

Albatrellus ovinus - a typically tangled group

Distribution

A fairly common find many parts of mainland Europe, from Finland down to the Mediterranean, Albatrellus ovinus has not been officially recorded in either Britain or Ireland (although it has been given an English name in the BMS list of recommended common names of fungi).

Above: Often these large and conspicuous polypores appear in densely-packed groups.

Taxonomic history

In 1762, when Jacob Christian Schaeffer described this unusual polypore, he gave it the scientific binomial name Boletus ovinus, which establishes its basionym. It was an American mycologist, William Alphonso Murrill (1869 - 1957), who in 1903 transferred this species to its current genus, whereupon its currently-accepted scientific name Albatrellus ovinus was established.

Synonyms of Albatrellus ovinus include Boletus ovinus Schaeff., Boletus albidus Pers., Albatrellus albidus (Pers.) Gray, and Scutiger ovinus Murrill.

Etymology

Albatrellus, the genus name, is not so easy to see through. Alba- means white, of course, while -ellus indicates something much smaller than the norm, and in this instance it must be the pores. So 'white fungi with very small pores' is the best I can come up with. Any other suggestions? The specific epithet ovinus comes from the - Classical Latin noun ovis, meaning a sheep. (The old common name Sheep Polypore seems an apt reflection of this simile.)

Identification guide

Cap of Albatrellus ovinus

Cap

7 to 18cm across, irregular, creamy white or pale grey; convex, soon flattening and becoming centrally depressed, distorted and lobed; margin wavy and usually remaining incurved; skin cracks when old or in very dry weather. Often several caps merge and become firmly conjoined.

Stem

Creamy white or light grey; 3 to 7cm tall, 1 to 3cm diameter.

Pores of Albatrellus-ovinus

Pores

White or creamy yellow; mostly oval; tubes decurrent; spaced at 2 to 4 per mm.

Spores of Albatrellus ovinus, the Sheep Polypore

Spores

Ellipsoidal to subglobose, smooth, 4-4.5 x 3-3.5μm, with a germ pore; inamyloid

Spore print

White.

Odour/taste

No significant.

Habitat & Ecological role

In woods, often under pines and other conifers. Some mycologists believe that this edible mushroom may be ectomycorrhizal with spruces.

Season

July to November in central Europe but into January or even February in southern Portugal and Mediterranean coastal areas.

Similar species

Albatrellus subrubescens is usually violet tinged on the cap surface, and it turns orange when bruised. Confident differentiation of these two very similar species requires microscopic examination of the spores, which are amyloid in Albatrellus subrufescens but inamyloid in Albatrellus ovinus.

Culinary Notes

This is one of the very few polypores with a tradition of culinary popularity... if you happen to live in Finland, that is, for there it is sold commercially in large quantities. Elsewhere the local field guides seem for the most part to offer a vague 'generally considered edible' but without advice of recipes. Despite having numerous opportunities to gather these chunky woodland fungi on mainland Europe, we have not yet tried them and so we are unable to comment from first-hand experience. In texture they are very similar to Hydnum repandum, the Wood Hedgehog, which we find delicious in all sorts of dishes from soups and risottos to our own favourite invention which we call 'Hedgehogs on Toast'.

Reference Sources

Pat O'Reilly (2016) Fascinated by Fungi; First Nature

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.

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