Sistotremastrum, Eriksson, 1958

Key to species View in CoL View at ENA

1. Cystidia present (leptocystidia)................................................................................................................... S. lateclavigerum

- Cystidia absent ...................................................................................................................................................................... 2

2. Subicular hyphae with oil drops in the cytoplasm. Spores narrowly ellipsoid, 5−6.5 × 2.5−3 µm ....................................... 3

- Subicular hyphae without oil drops in the cytoplasm ............................................................................................................ 4

3. Hyphae composed by rather short and wide cells. Subicular hyphae (10−)14−18 × (6−) 7−9 µm and subhymenial hyphae 8−12 × 4−5 µm .................................................................................................................................................. S. guttuliferum

- Hyphae composed by long and thin cells. Subicular hyphae (14−)20−23 × 4−6 µm and subhymenial hyphae 15−23(−38) × 3−4 µm ............................................................................................................................................................... S. chilensis

4. Spores subcylindrical to allantoid 6−9 × 2.5−3(−4) µm ............................................................................... S. niveocremeum

- Spores narrowly ellipsoid, 4.5−6 × 1.5−2 µm ....................................................................................................... S. suecicum