. Guide des modèles de champignons britanniques de Sowerby dans le département de Botany, British Museum (Natural History) . provoque ostreatiis et A. euosmus aresomeTimes vus au printemps. 38. Agaricus ulmarius Bull.—Pileucharny, compact, horizontal, régulier en formais excentré, convexe et lisse, livid-blanchâtre ou ocreux-blanc; charnblanc, dur; branchies sinuées ou arrondies be-hind, un peu surpeuplé, blanchâtre; taépais, solide, ferme, incurvé, excentré, blanc. L'odeur est puissante, et un peu de rang et d'acide. A. ulmarius, bien que peu courant dans certains districts, est fréquenté par le quartier de Lon

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. Guide to Sowerby's models of British fungi in the Department of Botany, British Museum (Natural History) . icits ostreatiis and A. euosmus aresometimes seen in the spring. 38. Agaricus ulmarius Bull.—Pileusfleshy, compact, horizontal, regular in formbut excentric, convex and smooth, livid-whitish or ochreous-white in colour; fleshwhite, tough; gills sinuate or rounded be-hind, somewhat crowded, whitish ; stalkthick, solid, firm, curved, excentric, white. The odour is powerful, and somewhat rank and acid. A. ulmarius, although uncommon in some districts, is frequentin the neighbourhood of London, where it grows, singly or gre-gariously, upon old, unhealthy, and damaged trees, hastening theirdecay. It is usually seen upon the elm, generally high up amongthe branches. Occasionally it grows upon other trees, as the beech, oak, and poplar. It is a wound-parasite, growing on accidental wounds ontrees ; the spores germinate on the wounded surface, and themycelium penetrates the trunk and causes it to decay. It is by some considered esculent, but the flesh is always toughand deficient in flavour.. Fig. 13.—Type form of Pleurotus.Agaricus corticatus Fr.(One-sixth natural size.) 39. Agaricus subpalmatus Fr.—Pileus fleshy, convex, thenflattened, clothed with a thick, tough gelatinous corrugated pellicle;gills rounded behind, broad, crowded, paler than pileus ; stalk solid, fibrous, soft, at length hollow, curved, smooth, fibrilloso-striate. The imbricated, gelatinous pilei are usually glued together. A. subpalmatus is a remarkable and beautiful species, said to be 2 2 GUIDE TO THE MODELS OF FUNGI. rare, but common in the neighbourhood of London and other towns.It usually grows in clusters on squared timber, and may frequentlybe seen in wood-yards ; it is less common on tree trunks and stumps, and generally appears late in the autumn or in early winter;sometimes it may be found in mid-winter. The whole plant is paleorange-buff, nankeen, or rufescent flesh-colour. It looks

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