taxonID	type	description	language	source
3F5A87BEE033535DF0B1FB7273C4FBF8.taxon	materials_examined	Type species: A. compactum Schwägr. (= A. aestivum (Hedw.) Mitt.)	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
3F5A87BEE033535DF0B1FB7273C4FBF8.taxon	description	Plants in dense or loose tufts, yellow-green in upper part, brownish below. Stems 0.5 – 4 cm, weakly branched, usually moderately tomentose, rounded-triangular in transverse section, with more or less strong central strand, weak sclerodermis, hyalodermis absent. Leaves distantly or densely arranged, straight or contorted and twisted when dry, erect-spreading when wet, uneven in size along the stem, forming alternating zones of smaller and larger leaves, ovate, ovate-lanceolate or oblong-lanceolate, with not differentiated or differentiated base, occasionally constricted above base, widest below or above midleaf, acute or acuminate, strongly keeled, narrowly grooved along costa ventrally; margins plane, entire or slightly crenulate at leaf base, sometimes uneven proximally; costa strongly projecting abaxially, ending few cells below apex, percurrent or shortly excurrent, with only dorsal stereid band, dorsal and ventral epidermis, occasionally ventral epidermis absent and guide cells exposed, ventral surface cells elongate, smooth, dorsal surface cells elongate, smooth proximally, slightly to strongly papillose distally; lamina unistratose, distal and median laminal cells subquadrate, densely papillose, papillae low and wide, bifid, rarer loosely papillose, basal laminal cells short rectangular, shorter to the margins, smooth. KOH laminal reaction yellow. Specialized asexual reproduction rare, by multicellular gemmae on rizhoids in leaf axils. Dioicous. Gametangia and sporophytes terminal on short lateral branches. Perichaetial leaves convolutesheathing, ovate-acuminate. Setae yellow-brownish. Urns yellow-brown, with red rim, elliptic, smooth and glossy, exothecial cells rectangular, thin-walled, annulus of two rows of slightly vesiculose cells, peristome absent. Spores 12 – 16 µm, finely papillose. Opercula with long oblique beak.	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
3F5A87BEE033535EF33BFBE372F8FDC0.taxon	materials_examined	Type: Japan “ Japon: Yezo (n. 599); Kofu (n. 2552). Corée: île Quelpaert (n. 5, 6, 74, 80) ” (not seen, one of syntypes illustrated by Saito, 1975, figs. 34 – 16).	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
3F5A87BEE033535EF33BFBE372F8FDC0.taxon	description	Plants small, in dense tufts or cusions, yellowishgreen in upper part, dark brownish below. Stems 1 – 2 cm, erect, simple or rarely forked. Leaves densely arranged and hiding the stem, contorted when dry, sometimes slightly spirally twisted, patent when wet, narrowly lanceolate, widest at or above mid-leaf, narrowed to the base, acute, strongly keeled, carinate, (0.45 –) 0.8 – 1.3 (– 1.6) mm long, 0.14 – 0.28 mm wide; margins plane, entire; costa + strong, 30 – 35 µm wide at base, excurrent into short apiculus to 3 – 4 cells long or percurrent, densely or loosely papillose dorsally in distal 2 / 3; upper and median laminal cells rounded-quadrate or transversely elliptical, 6 – 8 × 7 – 12 µm, + thick-walled, opaque, densely covered by massive, low, bifid papillae; basal juxtacostal cells smooth, with moderately thickened walls, short rectangular, 12 – 20 × 6 – 11 µm, becoming quadrate and transversely rectangular towards margins. Gametangia and sporophytes unknown in Russia. [Perichaetial leaves broad-ovate, narrowly acute at apex, 0.5 – 0.7 mm long, 0.3 – 0.4 mm wide at middle. Setae 3 – 5 mm long. Capsule short-cylindrical, 0.6 – 0.8 mm long, ca. 0.4 mm thick at middle. Opercum 0.7 mm long. Spores 9 – 12 µm (Saito, 1975)].	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
3F5A87BEE033535EF33BFBE372F8FDC0.taxon	materials_examined	Specimens examined: RUSSIA: Primorsky Territory: Olga District, waterfall on Milogradovka Creek, 310 – 370 m alt., Ignatov # 07 - 311, 07 - 295 (MW 9001560, MW 9001559); Sakhalinslaya Province, South Kuril Islands, Shikotan Island, Notoro Mt., 320 m alt., Bakalin K- 42 - 28 - 07 (MW 9001567); same place, area of Tomari Mt., 300 m alt., Bakalin K- 45 - 13 - 07 (MW 9001568) and Bakalin K- 45 - 3 - 07 (MW 9001569); JAPAN, Kyushu, Miyazaki Prefecture, Inohae Valley, Ignatov & Ignatova 98 - 509 (MW 9001570).	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
3F5A87BEE033535EF33BFBE372F8FDC0.taxon	description	Differentiation. Anoectangium laetevirens is similar to A. aestivum in plant size and leaves lacking constriction above their bases, but differs from it in leaf arrangement (dense, hiding stem vs. + spaced, exposing stem at places); leaf shape (widest above mid-leaf, not widened at base vs. widest below mid-leaf, usually widened at base); and costa length (percurrent or excurrent into short mucro vs. ending below apex). Ignatova (2009) tentatively referred these specimens to A. stracheyanum despite the absence of constriction in their leaves, considering them as an extreme variation of the latter species in harsh environments, but the present study confirms their separate species identity. The distinctions of A. laetevirens from A. stracheyanum include smaller size of plants, shorter and narrower leaves and absence of constriction above leaf base.	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
3F5A87BEE033535EF33BFBE372F8FDC0.taxon	distribution	Distribution and ecology. In Russia, A. laetevirens occurs mostly in Kuril Islands; its single locality in the mainland is in a valley near waterfall (albeit not very big one), providing high and constant air humidity, where some other rare mosses were found.	en	Ignatov, M. S., Kuznetsova, O. I., Ignatova, E. A. (2024): Once again on the genus Anoectangium (Pottiaceae, Bryophyta) in Russia. Arctoa 33 (1): 1-8, DOI: 10.15298/arctoa.33.01, URL: https://doi.org/10.15298/arctoa.33.01
