Archidium oblongifolium (Archidiaceae, subg. Archidiella) is proposed, described and illustrated as a new species based on collections from central Brazil. It is characterized by oblong leaves and lax leaf cells. A. oblongifolium is currently known only from three specimens from a single area, and could thus be considered vulnerable or threatened.

A taxonomic review of the epiphyllous taxa of the genus Radula Dumort. in Thailand is presented, based on herbarium specimens and field surveys. Nine species are recognized, including two new records, R. nymanii Steph. and R. stenocalyx Mont. One new species, R. grandilobula Promma et Chantanaorr., is described and illustrated. The new species is characterized by the leaf-lobe subtriangular-ovate to falcate-ovate with a narrowly rounded to obtuse apex; the leaf-lobule falcate-ovate, upper half broadly extended, free margin recurved, apex strongly turning away from the stem; and the discoid gemmae occurring perpendicularly on ventral surface of leaf-lobes. A key to species, brief descriptions and illustrations are provided; ecology and geographical distribution of the species are also noted.

Two species, Tortula brevissima Schiffn. and Grimmia indica (Dixon & P. de la Varde) Goffinet & Greven are added to the Chinese moss flora. The former is newly reported for China and East Asia. The latter has been found in Tibet for the first time. Brief morphological descriptions, distribution details, and digital photographs of the two species are provided.

The liverwort Ceratolejeunea bardatii sp. nov. (Lejeuneaceae) is described and illustrated from submontane, mesophilous valley forest of New Caledonia. The new species stands out by 1) leaf lobes with a 2-cells wide vitta of dark brown ocelli and some additional adjacent ocelli; 2) upper leaf margins with Allorgella-type denticulations; 3) utricles absent; and 4) perianths short obovoid and with 4 flat or twisted horns. The new species constitutes the first record of the genus Ceratolejeunea for New Caledonia.

The genus Notothylas Sull. in Thailand is reviewed, based on herbarium specimens and field surveys. Eight species of the genus are recognized and two of them, N. pandei Udar et V. Chandra and N. yunannensis T. Peng et R.L. Zhu, are newly recorded in the country. The new species Notothylas frahmii Chantanaorr. is described and illustrated. A key to species, brief descriptions and selected illustrations for the species of Notothylas of Thailand are provided.

Floristic and ecological features of aquatic bryophytes, and main abiotic factors, were studied in 23 mountain streams located in the Western Alps and Central Apennines (Italy). At 46 stations, a total of 36 taxa were collected. Most species showed both low occurrence (≤ 2 records) and low cover respect to sampled area (< 4%). However, in over 50% of stations, bryophyte communities with at least three species and cover over 10% were recorded. Platyhypnidium riparioides, Fontinalis antipyretica subsp. antipyretica and Hygrohypnum luridum were the most common and abundant species. Other species, more rarely recorded, have limited distribution in the Mediterranean region (Blindia caespiticia) and Italy (Hygrohypnum duriusculum). Some species show specific ecological preferences. In particular, Hygrohypnum luridum and Palustriella falcata are mostly linked to turbulent and cold waters (11.0–16.0°C), neutro-alkaline (7.3–8.4), with low conductivity (< 160 µS) and phosphates (< 0.01 mg/l) values. Brachythecium rivulare, Platyhypnidium riparioides and Fontinalis antipyretica subsp. antipyretica occur abundantly in less turbulent and less cold (15.3–18.2°C) waters, shaded, alkaline (8.3–8.6), with moderate conductivity (330–440 µS), and higher values of phosphates (0.06–0.09 mg/l). This study provides new floristic and ecological data on bryophyte communities occurring in mountain streams. It can also represent a useful contribution for biomonitoring activities of these habitats, often understudied floristically, where bryophytes are a significant part of the aquatic macroflora.

The Baltic amber fossil Jungermannia berendtii is transferred to Solenostoma based on the presence of numerous long rhizoids, distinct trigones, and subquadrate-rotund to elongate-elliptical leaves.

Bucklandiella didyma (Mont.) Bednarek-Ochyra et Ochyra and Codriophorus laevigatus (Mitt.) Bednarek-Ochyra et Ochyra are recorded for the first time from the Falkland Islands. Bucklandiella heterostichoides (Cardot) Bednarek-Ochyra et Ochyra, B. membranacea (Mitt.) Bednarek-Ochyra et Ochyra and B. ptychophylla (Mitt.) Bednarek-Ochyra et Ochyra are newly reported from East Falkland and B. sudetica (Funck) Bednarek-Ochyra et Ochyra is a new addition to the bryoflora of West Falkland. In total, seven species of Bucklandiella Roiv. are currently known from the Falkland Islands and they are briefly characterised, their geographical range is surveyed and global distribution of selected species is mapped. The status of five species of Bucklandiella which are excluded from the bryoflora of the archipelago is briefly considered. A key to determination of species of taxa of the Racomitrioideae in the Falkland Islands is presented.