Streblotrichum undetermined

Ignatov, M. S., Ishchenko, Yu. S., Kuznetsova, O. I., Fedorova, A. V. & Ignatova, E. A., 2024, The genus Streblotrichum (Pottiaceae, Bryophyta) in Russia, Arctoa 33 (2), pp. 210-225 : 224

OF STREBLOTRICHUM SPECIES IN RUSSIA

1. Perichaetial leaves contracted into acumina of 1/2– 1/3 of the the total leaf length .............................. 2

— Perichaetial leaves contracted into acumina shorter than 1/3 of the total leaf length ............................ 3

2. Seta red; apices of perichaetial leaves rounded ...... ........................................................ 1. S. jacuticum

— Seta stramineous-yellow, apices of perichaetial leaveacute or acuminate ................. 2. S. enderesii

3. Stem leaves obtuse or bluntly acute; perichaetial leaves contracted into narrow acumina; spores 11– 14 µm. ........................................... 3. S. taimyrense

— Stem leaves acute, apiculate, rarely obtuse; perichaetial leaves obtuse or shortly apiculate; spores (7–)8– 10(–11) µm ................................... 4. S. convolutum