24 



ARKIV FÖR BOTANIK. BAND 1. 



all stages of development). - 

 n. III, 1490, Rio de Janeiro. 



Glaziou n. 3352 and Regneli 



4. Trichomanes Kraussii Hook, et Grev. — Fig. 11—14. 



Hook, et Grev., Ic. Fil., 1829, tal). 149. — Hooker and 

 Baker, Synopsis Filicum, ed. 2, 1883, p. 77. 



Syn. Didymoglossum Kraussii Presl, Hymenophyllaceae, 1843, 



p. 23. 

 » » fructuoswn Fée, Filices Antillanae, 18(36,. 



tab. 28, f. 3. 

 » Hemiphlehiiim Kraussii Prantl, Die Hymenophyllaccen,^ 



1875, Taf. II, Fig. 21. 

 » IVielwmanes acropteron Fée, Cryptoganies vasculaires du 



Brésil, tab. 70, fig. 1. 



When Tr. Kraussii was first 

 published, it was represented by 

 an extreme, regularly' pinnatifid 

 form (Hook, et Grev., t. 149),. 

 which is very easy to distinguish 

 from Tr. qucrcifoliuni in the same 

 work, t. 11.5. 



However, Tr. Kraussii is in. 

 fact as variable or })olymorphous,. 

 as Tr. qnercifolium, and in a tuft 

 of it, together with the fronds, 

 which I should like to call ty- 

 pical, there are in most cases- 

 several others of diöerent shapes, 

 which make it very difficult to 

 settle on any fixed specific marks- 

 for this plants. A mere descrip- 

 Fig 12. Trichomanes Kraussii tion of 7V. Kraussii would hardly 

 Hook, et Grev.. apex of a frond ^^ sufficient to distinguish it 

 from Guadaloupe, Herb. Swartz ■/• t t tt i 



(see also fig. 11, A) - (X 5). irom Ir. qiiercifolmm. In Hook. 

 By the side of it two portions ^nd Bak., Synopsis, ed. 2, p. 77, 



troni the margin ot the involucre ^ "^ ^ . / n t 



(X 90). we find these two species (caUed 



pusilluni) and »Kraussii>) beside 



each other, — but the descriptions unfortunately are word 



for word the same, and nobody who reads them would under- 



