22 RAMALINA. 



* * Medullary cords uniting mostly with the cortical layer. 

 Spermogones commonly pale. 



3. E. reticulata (Noehd.) Kreinpelh. ; thallus much com- 

 pressed, linear, elongated and pendulous, very much branched ; 

 either narrow and somewhat channelled, with teretish tips, or 

 dilated; the longitudinally striate branches often united here 

 and there into a coarse network, and giving forth frequent, 

 lateral, oblong expansions which become foraminous, and at 

 length extended, and densely reticulate-perforate ; apothecia 

 mostly marginal, smallish to middling-sized, sub-sessile. Spores 



ellipsoid, and oblong, ^^ mic. Lichen, Noehden in Schrad. 



Journ. 1, tit. Krempelh. beschicht. d. Lich. 1, p. 86, 2, p. 617. 

 Nyl. Eecogn. p. 25. E. Menziesii, Tayl. in Lond. Journ. Bot. 6, 

 189. E. retiformis, Menz. herb., Tuckerm. Syn. N. Eng. p. 12. 



Trees; California (Menzies.), Noehden I. c. 1800. Northward 

 to Vancouver's Island, J". Macoun. The longest specimens seen 

 (a little exceeding a foot) altogether narrow-lobed ; from O mm> , 1, 

 at the extremities, to about l mm - wide. Other specimens run 

 from l mra - to I5 mm in width, and the widest, perforated expan- 

 sions exceed 20 mm -. Apothecia from 2 mm - finally 3-4 mm - wide. 



4. E. Usneoides (Ach.) Fr. ; thallus compressed and more or 

 less longitudinally striate, much branched and elongated, pen- 

 dulous, often at length spirally contorted, greenish-glaucous ; 

 apothecia smallish to middling, marginal, somewhat pedicellate. 



Spores fusiform, ^ mic. Nyl. Syn. 1, p. 291, /. 8, /. 27; 



Eecogn. p. 23. 



Trees in intertropical countries; common in Mexico, and 

 reaching Southern Florida, C. F. Austin. 



5. E. rigida (Pers.) ; thallus tufted, slender, terete, or terete- 

 compressed, smooth, or at length longitudinally striate, or be- 

 sprinkled often with white warts ; irregularly- and finally long- 

 branched, the branches attenuate, and the tips filiform ; 

 apothecia lateral, smallish to middling-sized. Spores ellipsoid 



and oblong, ^ mic. Lichen, Pers., e Nyl. inProdr. N. Gran. 



p. 15, not. E. gracilenta, Fr. L. E. p. 29, e Nyl., ibid. E. 

 tenuis, Tuckerm. Suppl. 1 , 1. c. p. 423, part. E. rigida, E. gra- 

 tilis, & E. gracilenta, Nyl. Eecogn.pp. 14, 17, 19. 



Trees; Florida (A. W. Chapman), Tuckerman I. c. 1858. 

 Louisiana, J. Hale. Texas, Wright ; and Mexico. Earely also 



