Tremella

Botanical Profile

Tremella fuciformis is a gelatinous basidiomycete known as white jelly fungus, snow fungus or silver ear. From a raw-material perspective, dried fruiting bodies, polysaccharide extracts, cosmetic fractions and cultivation products must be distinguished.

Tremella fuciformis forms white to cream-coloured, translucent, lobed-gelatinous fruiting bodies with a high water-absorption capacity. The fungus has a distinctive ecological lifestyle and in cultivation is closely associated with other wood-inhabiting fungi, particularly host or partner fungi on woody substrates. Tremella has long been cultivated in East Asia and traded as an edible mushroom and dried raw material. The dried fruiting bodies swell strongly in water and develop a characteristic gelatinous texture. Relevant quality factors include purity, colour, swelling capacity, sulphuring or bleaching processes, foreign fungi and microbiological quality. Tremella extracts are considered primarily for their polysaccharide fractions.

Phytochemistry

Tremella fuciformis contains high levels of water-binding polysaccharides, including heteropolysaccharidic glucuronoxylomannan and related mucilage-like fractions. Proteins, amino acids, minerals, small amounts of fat, phenolic accompanying substances and fibre components are also present. The polysaccharides are central to the gelatinous texture, swelling capacity and technological properties. Depending on production, extracts can have very different molecular weights, viscosities and sugar compositions. In cosmetic raw materials, the moisturising and film-forming properties of polysaccharide-rich fractions are frequently considered from a technological perspective. Whole fruiting bodies, fine powders and purified polysaccharide extracts are not chemically or functionally equivalent.

Traditional Uses

Tremella fuciformis has a long history in Chinese cuisine and food culture. The fungus is used in soups, sweet dishes, beverages and desserts and is valued for its delicate gelatinous texture. Dried Tremella fruiting bodies were a storable raw material and were soaked before preparation. In East Asian traditions, Tremella was also regarded as a valuable edible mushroom combining culinary and aesthetic qualities. Traditional uses relate mainly to whole or cut fruiting bodies in aqueous preparations; modern polysaccharide fractions and cosmetic active-ingredient raw materials have their own specifications.

Current Research

Research on Tremella fuciformis focuses on polysaccharides, molecular-weight distribution, water binding, antioxidant test systems, skin and moisture models, fermentation, cultivation and food functionality. Cosmetic research investigates Tremella polysaccharides as natural hydrocolloids and film-forming raw materials. Food-technology studies address texture, swelling capacity, drying and product development. Many experimental studies concern isolated polysaccharide fractions whose properties depend strongly on extraction, purification, degradation and drying. Findings on highly purified fractions cannot be transferred directly to whole fruiting bodies or simple powders.

Sources

• Index Fungorum and MycoBank: Tremella fuciformis Berk.
• Specialist literature on Tremella fuciformis polysaccharides and glucuronoxylomannan fractions.
• Food and cosmetic raw-material literature on Tremella.