Polytrichastrum sphaerothecium (Besch.)

Sofronova, E. V., Afonina, O. M., Bakka, S. V., Bezgodov, A. G., Czernyadjeva, I. V., Doroshina, G. Ya., Dudov, S. V., Dulin, M. V., Dzizyurova, V. D., Fedosov, V. E., Freydin, G. L., Garin, E. V., Ginzburg, E. G., Glazkova, E. A., Goldstein, M. S., Grishutkin, O. G., Ignatova, E. A., Kapitonov, V. I., Kapitonova, O. A., Khairetdinova, V. O., Konstantinova, N. A., Kotkova, V. M., Kurbatova, L. E., Kushnevskaya, E. V., Kuzmina, E. Yu., Lavrskaya, E. A., Mamontov, Yu. S., Moseev, D. S., Philippov, D. A., Pisarenko, O. Yu., Popova, N. N., Potemkin, A. D., Ryzhova, Е. М., Savchenko, A. N., Shestakova, A. A., Schuryakov, D. S., Selivanov, A. E., Shkurko, A. V., Shubina, T. P., Smirnova, E. V., Voronova, O. G., Zheleznova, G. V. & Zhuzenova, K. A., 2025, New bryophyte records. 24, Arctoa 34 (1), pp. 73-92 : 87

Polytrichastrum sphaerothecium (Besch.) J.-P.

Frahm – Northern Kuril Islands, Onekotan Island, southern part of the island, Krenitsyn volcano (49.36667°N – 154.75497°E), old caldera Tao-Rusyr , on a vertical rock wall in crevices, S +, 21.VII.2024 Glazkova [Глазкова] { LE В-0043301}, det. Kurbatova. Polytrichastrum sphaerothecium is a protected species in the Sakhalin Province (Eremin & Taran, 2019) and previously known from the islands of Paramushir, Kunashir and Iturup ( Ivanova et al., 2014; Ignatov et al., 2017) .

New liverwort records from Svalbard. 2. – Новые находки печеночников на Шпицбергене. 2. N.A. Konstantinova & A.N. Savchenko – Н.А. Константинова, А.Н. Савченко

New for the archipelago – Новые для архипелага

Tritomaria exsectiformis (Breidl.) Schiffn. ex Loeske subsp. arctica R.M. Schust. – Oscar II Land, Värmlandryggen , west coast of Ymerbukta (78°14'19''N – 13°54'2''E), 37 m a.s.l., lower part of steep east facing rocky slope, Salix polaris- moss tundra, on side of bryophyte covering hummock, 17.VII.2012 Konstantinova & Savchenko # K237-2-12, mixed with Sphenolobus minutus (Schreb. ex D. Crantz) Berggr. , Cephaloziella varians (Gottsche) Steph. , Lophozia silvicoloides N. Kitag. , Cephalozia bicuspidata (L.) Dumort. {KPABG K237-2- 12}, ibid. Konstantinova & Savchenko # K237-2-12, mixed with Scapania obcordata (Berggr.) S.W. Arnell , Cephaloziella varians {KPABG K237-4-12}. Tritomaria exsectiformis was recorded in Svalbard only by Arnell & Mårtensson (1959) from “near NY-Ålesund.” A. Frisvoll ( Frisvoll & Elvebakk, 1996) suggested that this record refers to subsp. arctica R.M. Schust. However , based on Damsholt's personal communication Süderstrüm et al. (2021) referred this record to subsp. exsectiformis . In collected by us specimens plants are very small, just 4–6 mm long and 0.5–0.7 mm wide, have concave mainly as wide as long leaves, ca. 0.6–0.75 × 0.65–0.75 mm, small midleaf cells, ca. (12)15–17(19) × 17–20(22) µm, numerous red to reddish brown angulary polygonal with admixture triangular gemmae, ca. (10)12–14 wide and 15–18(23) µm long and thus fits well subsp. arctica .