14 



ARKIV FÖR BOTANIK. BAND 1. 



labels (such specimens have originally belonged to other her- 

 bariums, as Osbeck's and Casströni's). I therefore consider as 

 authentic »muscoides» (hymenoides Hedw.) a specimen, on which 

 Swartz has written the diagnosis published in his Flora In- 

 diae occidentalis and Synopsis Filicum, ISOR; and the greater 

 part of the other samples, which here in Stockholm are named 

 •>muscoides Herb. Swartz,» fully agree with this specimen. 

 My drawing, fig. 1, A, will show, that this species also 

 agrees with Hed wig's Trich. hymenoides (1799), quoted by 



Swartz; I may add, that Hedwig's 

 description is far superior to that in 

 Swartz's Synopsis. 



When elliptical fronds are found 

 intermixed in a tuft, it is exceedingly 

 difficult to distinguish this species 

 from others, as Tr. Kraussii, fig. 11, A. 

 I have therefore carefully com- 

 pared the cellular structure of these 

 plants, and am convinced, that Tr. 

 hymenoides is quite distinct from all 

 the others, except Fee's Tr. sociale 

 (fig. 4 — 6). Its frond has a more 

 rigid and papyraceous texture, than 

 Fis- 2. Trichomanes hynie- the other small Trichomanes; ^ the 

 noides Hedw., upper half of an ^^^^g^^a and some main veins are often 

 oblong frond (see also lig. 1, is) i j. i 



from South Paraguay, Exped.l. thick and firm enough to be pro- 

 Regneii., n. A, 18U3 (X 5). minent above the surface; the rest 



of the frond is somewhat stiffer 

 and brighter than usual (this is often seen in old, fertile 

 fronds, when the colour is changing to yellow), and the frond 

 is generally more or less undulated or crisped. This evi- 

 dently depends upon the cellular structure. I found the cells 

 very large in the West Indian as well as the South Ameri- 

 can specimens, and their walls exceedingly thick and firm, 

 fig. 3. A cell is often 0,i mm long, and the wall is O.oio — 

 0,012 mm thick. In Tr. Kraussii the walls are much thinner (see 

 below, fig. 11). 



In Tr. hymenoides the frond is generally shortly stalked 

 or nearly sessile, but not always, as proved by a frond from 



1 Except those, where the veins are very thick and exceedingly crowded, 

 for instance Tr. punctatum Poir. and lineolatum Hook. 



