A critical review of type specimens for Polygala species (Polygalaceae) collected during the Malaspina Expedition of 1789–1794 Agustina MartinezPablo MoroniJosé Floriano Barêa Pastore Original Research 18 March 2022 Pages: 107 - 122
Remarks on aerophores and the relationship between sterome and stomata in ferns Robbin C. Moran Original Research 05 May 2022 Pages: 123 - 147
Two new species of Goniopteris (Thelypteridaceae) from Ecuador and Peru Susan FawcettRobbin C. MoranAlan R. Smith Original Research Open access 11 April 2022 Pages: 148 - 154
The fern genus Saccoloma (Saccolomataceae) in Brazil, including new species and new combinations Pedro B. Schwartsburd Original Research 16 March 2022 Pages: 155 - 179
A new species of Myriopus (Heliotropiaceae) from Brazil José Iranildo Miranda de MeloRainara Silva SantosDaniela Santos Carneiro-Torres Original Research 09 March 2022 Pages: 180 - 185
Vochysia pongo-qonecensis (Vochysiaceae), a new species from the Peruvian Andean-Amazonian piedmont forests Isau Huamantupa-Chuquimaco Original Research 17 February 2022 Pages: 186 - 192
Eugenia bragae (Myrtaceae), a new species from the Atlantic Forest of Rio de Janeiro State, Brazil Thiago FernandesJair E. Q. Faria Original Research 21 March 2022 Pages: 193 - 201
Rediscovery and first record of Octomeria romerorum (Orchidaceae, Pleurothallidinae) for Brazil Dayse Raiane Passos KrahlAmauri Herbert KrahlMario Henrique Terra-Araújo Brief Report 02 May 2022 Pages: 202 - 206
Re-evaluation of the identities of Glossadelphus borneensis and its associated synonyms, G. attenuatus and G. nitidus Zhao-Qin YiSi HeYu Jia Original Research 07 February 2022 Pages: 207 - 214