LINDMAN, AMERICAN SPECIES OF TRICHOMANES SM. 



•Ii) 



stand, that they describe two different species, if the original 

 drawings were not quoted. 



After many researches among accessible specimens — in 

 many cases of all the fronds of a specimen — , I am now 

 convinced, there is a South and Central American plant, which 

 must be referred to Tr. Kraussii Hook, et Grev., as a proper 

 species, and this can always be distinguished by certain cha- 

 racteristics, which are to be searched for in every tuft, though 

 they f-annot be recognized 

 on every frond of a speci- 

 men. Only in its extreme 

 forms, and when in full con - 

 formity with the original 

 drawing in Hook, et Grrev., 

 t. 149, can a plant be clas- 

 sified without hesitation as 

 Tr. Kraussii. I believe that, 

 when inspecting a large col- 

 lection of specimens, sam- 

 ples will always be met 

 with, which seem to a])- 

 jtroach in external habit to 

 Tr. quercifolium (as I have 

 made out it above). As the 

 specific marks are rather 

 difficult for an untrained 

 eye, they will ])e under- 

 stood best by comparing 

 the two allied species di- 

 rectum I therefore deem it 

 advisable to give various 

 drawings of the latter also, 

 fig. 11 — 14, all enlarged on 

 the same scale (x 5), as 

 those of quercifolium. Start- 

 ing from the drawings of Hooker and Greville, I think the 

 ])rincipal distinguishing marks may be expressed in the follow- 

 ing terms: 



Fig. 1.'). Trichomanvs Kraussii Hook, et 

 Grev. (X 5), A base of a sterile frond from 

 ilatto-Gros^iO, Brazil, Exjied. 1. Regnell., 

 II. A, 2207.',: B apical segments and in- 

 volucres of a s])ecinien from Matto-Grosso, 

 Exped. 1. Regnell., n. A. 3261; C middle 

 of a fertile frond and its involucre of a 

 specimen from French Guiana in Herb. 

 Stockholm, collected by Saget. 



