258 CYSTOCOLEUS. 



1. C. Linkii, Ehrenb. ; thallus orbicular, attached at the 

 side in the manner of some Polypori, and with a similar strati- 

 form, growth; glaucous-green; apothecia from pale-yellowish 

 becoming reddish. Spores fusiform-ellipsoid, simple and bilocu- 

 lar, -^ mic. Mont. Cuba, p. 107. 



On trees in tropical countries, Mexico. G. Linkii, v. Lep- 



rieurii, Mont. Guy. in Ann. 3, 16, p. 47, can scarcely be kept 

 apart by the given character. C. Leprieurii, Nyl. Coenog., 

 founded apparently on the Guyana lichen, is yet differently dis- 

 tinguished by the greater slenderness of the filaments (11-16 

 mic. thick, according to Nylander, while the filaments of this 

 author's C. Linkii are reckoned 20-30 mic. thick) and simple 

 spores ; but the latter difference is not to be depended on, and 

 the former, so far as my specimens (averaging say 12-20 mic.) 

 go, is equally uncertain. 



2. C. interpositum , Nyl. ; thallus irregularly effuse ; of the 

 colour of the preceding ; apothecia pale. Spores oblong, simple 

 and bilocular, -^ mic. Obs. sur. les Cosnog. 1. c. p. 91. 



Trees. Louisiana (Hale], Nylander I. c. 1861. Texas, Hall. 

 Florida, Austin. As also in Cuba (determ. Nyl.), Wright Lien. 



Cub. n. 171. Filaments from 14 mic., scarcely exceeding 20 



mic., in thickness. From this, Nylander I. c. has distinguished 



his C. disjunctum by coarser filaments (23-36 mic. thick, Nyl.) 

 and larger spores (^^ mic., Nyl.) which may possibly be repre- 

 sented here by a too small specimen from Mobile, Alabama, 

 Mohr, in herb. Willey. The Cuban specimen of this C. disjunc- 

 tum (Wright Licli. Cub. n. 170) which is accepted by Nylander, 

 is a better developed plant than C. interpositum, and has much 

 of the regularity of C. Linkii. 



3. C. moniliforme, Tuckerm. ; thallus effuse; thin; from 

 yellowish- becoming olive-green ; the short filaments moniliform ; 



apothecia bright red. Spores oblong, bilocular, mic. Tuck. 



in litt., and in Wright Lich. Cub. n. 172. Nyl. Ccenog. I. c. p. 92. 

 Tuck. Obs. Lich. 2, I. c. p. 416. 



Trees. Florida, Austin. As in Cuba, Wright. 



XLIV. CYSTOCOLEUS, Thwaites. 



A sterile, confervoid plant, blackish-brown when dry, but 

 shewing black-greenish when wet, and differing also from Cceno- 





