— 287 — 



descriptions some figures, which are absolutely exact, drawn up 

 after a sort of nature-printing, and show parts of the original 

 specimens. 



I am greatly indebted to the curators of the Royal herbaria 

 of Copenhagen and Berlin, of the Riksmuseum of Stockholm, to 

 Dr. H. Christ of Basle and to Dr. Carl Lindman of Stockholm, who 

 have placed specimens in my hand to examination. — The abbre- 

 viations used in the following mean: 



HB = Herb. Berolinense, Berlin. 



HH = Herb. Hauniense, Copenhagen. 



HS = Herb. Stockholmiæ. 



A key to the species. 



I. Coslulæ (venae laterales secundariæ) nullæ. Maciilæ (supra maculam 

 coslalem) uni-vel subbiseriatæ. 



A. Rhizoma scandens. Folia pinuata cum apice pinnatifida. 



Pinnæ distincte ad rachidemarticulatæ.multijugæ 1. L. guianensis \Auh\.) 



B. Hhizoma repens. Folia pinnata cum impari. Pinnæ non 

 arliculatæ. 3 — 5 jugæ 2. L. serratus (Kuhn). 



II. Costulæ distinctæ. Maculae (supra maculam costalem) 

 2 — 6 seriatæ. 

 A. Folia disticha, distantes (L. Lindigii?). 



1. Maculæ rarissime appendiculatæ. 



a. Pinna terminalis lateralibus conformis, non cum 

 superioribus confluens. 



a. Pihizoma repens. Maculæ 2 — 3 seriatæ. Pinnæ 



folii sterilis 10 — 15*^"' longæ. . 3. L. serratifolius (Mert.) 



ß. Rhizoma scandens (lide Mettenius). Maculæ 

 5 — 6 seriatæ. Pinnæ folii sterilis 15 — 25'=™ 

 longæ 4. L. Lindigii (Mett.) 



b. Pinna terminalis decurrens et cum lateralibus 

 superioribus decurrentibus confluens. Maculæ 

 irreguläres, 5 — 6 seriatæ 5. L. opacus (Mett.) 



2. Maculæ sæpe appendiculatæ, 3 — 4 seriatæ, irreguläres, 

 a. Folia sterilia ovato-elongata. Pinnæ versus apicem 



frondis decrescentes , levitor serratæ 6. L. contamitioides 



(Christ). 



