272 



26 



pubescentibiis. Pinnis inferioribus 4 — 6 jugis sensim reductis, imis minimis, mcdia- 

 libus alternis, lineari-lanceolatis, 5—6 cm. longis, 1 — l'/a cm. latis, breviter acumi- 

 natis. Laciniis paulum obliquis, obtusis vel subacutis, basalibus aequaiibus vel inter- 

 duni paulum abbrevialis. Venis indivisis, 6—8 jugis. Soris supramedialibus, parvis. 

 Indusiis in speciminibus plurimis non repertis, parvis, glandulis rubris nonnullis 

 inslructis., Sporangiis set o sis. 



No species of this group has been so much misunderstood as D. concinna. Most 

 authors have evidently been misled by the diagnosis in Syn. Fil., which does not 

 at all agree with our plant. What Bakeu may have meant by his Nephr. concin- 

 num it is impossible to say; his description agrees best with D. riimlarioides, but 

 more probably it covers a number of different species. As the species occurs in 

 Jamaica, one of Jknman's numerous species is certainly identical with D. concinna, 

 bul judging from his descriptions alone I cannot find out which it may be. 



The species is one of the most easily recognizable from its long and rather 

 narrow leaf, without long hairs but with the rachis and costæ Ijeneath densely 



Fig. 2. D. concinna (Willd.) O. Ktze. 

 From the type specimen (Small form). 



Fig. 3. D. Stierii (Hos.) C. Chr. 

 From the type specimen. 



and very shortly pubescent and especially by its setose sporangia. Some forms 

 recall D. panamensis in habit, but that species is alwaj's glandulose beneath, has 

 long hairs and enlarged basal pinnæ. From D. oligocarpa and allied species D. 

 concinna is easily recognized by the above mentioned peculiarities. 



To this species I refer as a variety : 



Phegopteris elongata Fournier, PI. Mex. 1: 87. 1872. 



I have not seen the type specimen from Mexico: San Christobal pr. Orizaba 

 leg. Bott n. 1442, but a specimen leg. Liebmann, Mexico: Colipa (HH) determined 

 by FouRNiEK as this form. With this agree Pringle n. 1984, Mexico : Sierra Madre 

 near Monterey (HC), and Biolley n. 100, Costa Rica: San José 1169m. (HC). 



The var. elongata (Fourn.) agrees perfectly with the typical D. concinna in 

 pubescence and in having setose sporangia, but it differs mainly in habit. The 

 lamina is downwards subabruptly reduced with 5 — 6 pair of very small, auriculi- 

 form pinnæ. Segments closely-placed, more acute than in type, the basal ones 

 sometimes lengthened; pinnæ 1 dem. long by 2 cm. broad. In its broad leaf and 

 pinnæ it resembles Ü. panamensis. 



