Mamontov, Yu.S., T.I. Koroteeva & A.K. Ezhkin. 2023. Frullania hamatiloba, а liverwort species new for Russia found in Sakhalin

Arctoa (2023) 32: 233–236

doi: 10.15298/arctoa.32.21

Frullania hamatiloba is recorded for the first time for Russia from Sakhalin. It is a northernmost locality for this species, for which was previously known from Japan (Hokkaido, Honshu, Shikoku, and Kyushu), Taiwan, China (Anhui, Guangdong) and the Korean Peninsula. The species is distinguished by (1) relatively large, shallowly bilobed (up to 0.26 the length) underleaves with obtuse to acute lobes and mostly angulate sinus, (2) characteristic leaf lobules which are transversely to longitudinally elongated (when well-developed), with incurved rostral portion, and (3) tuberculate perianth with three keels. Description and photomicrographs of F. hamatiloba from Sakhalin are provided together with discussion on its ecology and differentiation from having much in common F. fauriana, F. kagoshimensis, F. pedicellata, F. taradakensis and F. usamiensis.