ARKIV FOR BOTANIK. 



BAND 1. 



Remarks on some American species of Tricho- 

 manes Sm. sect. Didymoglosstitn Desv. 



by 



C. A. M. LINDMAN. 



Witli 31 illustrations, 

 ^"ommunicatcd Febr. 11 190H by V. Wittrock and A. G. Nathorst. 



By the kind permission of the Director, Professor A. G. 

 Nathorst, I began some time ago to examine several groups 

 of American ferns in the great herbarium of the Botanical 

 Museum (Riksmuseets Afdelning för arkegoniater och fossila 

 växter) at Stockholm, chiefly in order to classify a collection, 

 wliich I brought home from a journey to Brazil and Para- 

 guay during the years 1802 — 94. For this purpose also I 

 profited by the right of admittance to the Regnellian herba- 

 rium (Riksmuseets Botaniska Afdelning), kindly allowed me l)y 

 the Director, Professor V. B. Wittrock; my collection belongs 

 to this herbarium and will, when classified, be incorporated 

 with it. In the herbaria above mentioned some genera seem 

 never to have been worked through, particularly the species 

 of Trichomanes, which are included by Desvaux, Presl, and 

 Van den Bosch under the generic name Didymoglossum. Yet, 

 as I found there man}' original specimens from 0. Swartz's 

 herbarium, \ attempted to set in order and to name the dif- 

 ferent species of these small mosslike plants, but whilst doing 

 so, I was struck by the contradiction between some samples 

 in Herb. Swartz and the descriptions given in the best hand- 

 books, as Hooker, Species Filicum, 1 (1846), Hooker and 

 Baker, Synopsis Filicum (ed. 2, 1883), and, according to 



