

INTRODUCTION 



His Highness, Prince Roland Bonaparte, forwarded to 

 me in the summer of 1919 for détermination a lot of 

 Hymenophyllaceae collected in Madagascar by M. H. Février 

 de la Bâthie and M. d' Alleizette. Among the spécimens 

 examined were several belonging to the section Microgo- 

 nium which apparently were undescribed. I, therefore, under- 

 took a thorough revision of ail the African spécimens to 

 which I had access and which belong to the said section. 

 My resuit is laid down in this small paper, which His 

 Highness wished should be included in the séries: Notes 

 Ptéridologiques. The type-specimens of ail species hère 

 described as new are in Herb. Bonaparte, Trichomanes 

 fulgens only excepted. Besides the species belonging to the 

 section Microgonium three other species of Trichomanes and 

 one of Hymenophylluni, ail from Madagascar, are described 

 as new. 



For the permission of publishing thèse new species in 

 "Notes Ptéridologiques" my most sincère thanks are due to 

 His Highness, Prince Bonaparte, as also for the permission 

 of illustrating the species by exact figures. Such drawings 

 give a better understanding of similar small species than 

 the most detailed description. 



Copenhagen, June 1920. 



Cari Christensen. 



