Tremella cetrariellae

Tremella cetrariellae is a tiny jelly fungus that parasitises one Arctic-alpine lichen, Cetrariella delisei, forming brown to black galls on its thallus. It lives only in polar and subpolar Scandinavia, Russia, Greenland and Svalbard. It cannot be cultivated; these notes describe its habitat rather than a growing method.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity —Band in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal rest

Where it grows wild

Forms galls on the ground-dwelling lichen Cetrariella delisei on siliceous rock and in dwarf-shrub tundra, often in snowbed sites.

Recorded at 5–1325 m, median 1000 m; low near the Arctic coast, higher inland.

NorwaySwedenFinlandRussiaGreenlandSvalbard

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app.