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A new fern species, Polystichum neoacutidens (Dryopteridaceae), is described and illustrated from a limestone area in northeastern Thailand. It is distinguished from its closest relative, P. acutidens, by the color of petioles and rachises, density of petiole scales, and position of sori.

A new fern species, Diplazium thailandicum (Athyriaceae), is described. It was discovered from the North of Thailand. It is distinguished from the most similar species, D. chioui and D. lobatum, in having a pinnatisect base of the terminal pinna, 5–8 pairs of oblong lateral pinnae with stalk < 5 mm, and sori curved, 0.5–0.7 cm long, and borne half way between midribs and margins.

A new fern species, Hypodematium boonkerdii (Polypodiaceae subfamily Hypodematioideae), is described and illustrated from a limestone area in northeastern Thailand. It is distinguished from its closest relative, H. crenatum, by having a membranous lamina texture, sessile or subsessile pinnae and only one sorus per pinnule segment.

Seven species are reported to the bryoflora of Thailand for the first time, one hepatic (Aneura maxima) and six mosses (Bryum russulum, Campylopus flagelliferus, C. fragilis, C. laxitextus, Dicranodontium didyction and Pohlia leucostoma).