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Description

Properties

The elm or hardwood mushroom (Hypsizygus ulmarius) is a species of fungus in the Tricholomataceae family.

Hypsizygus ulmarius is a relatively rare parasite that prefers to attack weakened elms and, more rarely, other deciduous trees. After the tree dies, it switches to a saprophytic lifestyle.

“True” cultures of Hypsizygus ulmarius are unfortunately very rare. Many dealers will sell you as “elm side fungus”, or “elm oyster” under a false Latin name a side fungus species from the northwestern USA, mistakenly dubbed Hypsizygus ulmarius due to a mix-up. The common name “Elm oyster” in the English-speaking world did the rest to spread the confusion unintentionally.

The elm oyster is edible. Since its occurrence has declined sharply in recent years, the species should be protected.

The relatively rare Hypsizygus ulmarius grows parasitically on living or freshly felled deciduous trees, especially elms. It produces a white rot in the substrate. The tufted fruiting bodies often appear on living trunks at a height of several meters.

The variety now known in specialist circles as “pseudo elm oyster” was commercially successful for many years because it fructifies quickly and produces high yields. But Hypsizygus ulmarius never forms run-down lamellae as the “pseudo elm oyster” does.

1. Growing

Growing Procedure

Breeding attempts of Hypsizygus ulmarius are hardly documented, but this is probably more due to the problems mentioned above and the relative rarity of the species. Unsterile on elm logs or sterile on a substrate containing elm wood and high-caloric aggregates (prefer to feed your elm grasslings with pure hardwood).

Expect a maturation period of several months.

Elm Oysters often benefit from scratching the surface. Unlike cultivated hybrids of other rasling species, wild elm raslings do not fruit in swarms, but as small groups of individual mushrooms.

Growing

Agar Culture Media: MEA, MYA/PDYA
Cropping: 2 harvests, 7-10 days apart
Containers for fruiting: Straw bales, tree trunks, mushroom bed, culture in greenhouse
Biological efficience: 100-200%
Substrates: Rye Berries, grain mix, Straw, coffee grounds, paper, hardwood: poplar, alder, aspen, maple, ash, beech, willow, elm, oak, birch

Growing Characteristics

Extensive, late summer to late fall, usually tufted, very rare

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Temp °C
21-27 10-13 13-18
Relative Humidity %
95-100 95-100 90-100
Duration d
14-21 +7rest 5-10 4-7
CO2 ppm
>1000 <1000 600-1500
FAE per h
0-1 4-8 4-8
Light lux
5001000 500-1000

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Natural Habitat

Hypsizygus ulmarius fruits from Oktober till November.

On alive hardwood, rarely on dead wood, likes elms

2. Identification

Cap

16 (25) cm Ø
-yellow ochre, pale yellow ochre, grayish yellow
-fibrous ingrown
-indented
-concentrically arranged
-cap skin with brown spots
-smooth
-often with conspicuous water spots
-round
-margin long-rolled
-brownish when old
-habitus shell-shaped
-mostly lobed

Hymenium

-whitish to creamy yellowish
-sometimes slightly decurrent
-adherent
-crowded
-with intermediate lamellae
-cut edges near the stem often strongly wavy

Veil

Stipe

-7-18 (20) cm long
-2-4 (5) cm Ø thick
-cylindrical
-light yellow, yellow ochre, grayish yellow
-longitudinally fibrous
-base cheerfully whitish due to mycelial filaments

Hyphae

Spores

-white
-round to ovoid
-3-7 x 3.9-5.5 µm
-often also filled with a large droplet
-hyaline
-smooth
-teardrop-shaped
-with four spores
-buckles present

Danger of confusion

Berindeter Seitling, Marmorierter Holzrasling, Gelbblättriger Rübling, Waldfreund Rübling

© Martin Livezey (MLivezey)

3. Consuming

Gourmet

Hypsizygus ulmarius is a tasty mushroom, which surprises with his flavours.

Flesh

white, yellowish, yellow to base, coarse, tough, fibrous

Taste

soft, sour, a bit floury-cucumbery

Smell

sour, watermelon, floury-cucumber or even herring-like

Nutritional content

.

4. Data med, edible

other names

Dänisch Elmehat
Englisch
Elm Mushroom
Finnisch
jalavanrunkokynsikäs
Finnisch
runkovalmuska
Französisch
Lyophylle de l’orme
Litauisch
Guobinė kupstabudė
Norwegisch
almeknippesopp
Russisch
Гипсизигус ильмовый
Schwedisch almskivling
Tschechisch líha jilmová
Ungarisch
Laskapereszke
Wissenschaftl. Name
Hypsizygus ulmarius
Wissenschaftl. Name
Lyophyllum ulmarium
Wissenschaftl. Name
Pleurotus pantoleucus
Wissenschaftl. Name
Pleurotus ulmarius

other names

Ulmenrasling, Ulmenholzrasling, Ulmenseitling, Hypsizygus Ulmarius, Lyophyllum Ulmarium, Ulmenausternpilz, Shirotamogitake, Da Yu Mo, Shirotamogitake

Kingdom Fungi

Division Basidiomycota
Class Basidiomycetes
Order Agaricales
Family Tricholomataceae
Genus Hypzisigus
Species Hypzisigus ulmarius
Ecology Parasitic

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