Lichenes, by Babington $ Mitten.) FLORA OF TASMANIA. 343 
articulatis, articulis diametro brevioribus multistriatis, striis longitudinalibus angustis (demum in sporidia 
mutatis ?). 
Has. Parasite on Zostera. Georgetown, Gunn. 
Forming a bright, rosy-purple fringe, 2-3 lines long, on the leaves of Zostera, Externally it resembles 
B. ciliaris, but the microscopic character is different. 
Gen. CXXV. LYNGDYA, 47. 
(Ag. Syst. p. 25. Kiitz. Sp. Alg. p. 279. Harv. Phyc. Brit., etc.) 
l. Lyngbya ferruginea (Ag. Syst. p. 73; Harv. Man. ed. 2. p. 226; Harv. Phyc. Brit. t. 311). 
Has. Georgetown, W. H. H. Native of Europe, in the sea and brackish water. 
Gen. CXXVI. CALOTHRIX, 4j. 
(Ag. Syst. p. 24. Kiitz. Sp. Alg. p. 311. Harv. Phyc. Brit., etc.) 
1. Calothrix infestans (Harv.); parasitica, seruginosa, filis primo decumbentibus alias Algas in- 
vestientibus, dein ascendenti-erectis brevibus flexuosis obtusis simplicibus v. appositione ramulosis, striis 
endochromatis creberrimis. 
Has. Parasite on Cladostephus ferrugineus, at Port Arthur, W. H. H. 
Gen. CXXVII. OSCILLATORIA, auch. 
1. Oscillatoria sp. 
Has. In brackish water: at Georgetown, Gunn. 
Probably referable to O. spiralis, Carm., or some allied species, but we confess ourselves unable to recognize 
the specific characters attributed to the multitudinous book-species of this genus already published, and are un- 
willing to add new names to the list. The specimens are not in very good order. No doubt many other “ species” 
exist in Van Diemen's Land. 
Tripe VI. NOSTOCHINE. 
Gen. CXXVIII. PROTOCOCCUS, 49. Syst. p. 17. 
1. Protococcus monas (Ag. Ic. Alg. Eur. t. 11; Kütz. Sp. Alg. p. 200). 
Haz. On a damp wall near Launceston, Gunn. 
This agrees very well with Agardh's figure above quoted. 
Nar. Og». IX. LICHENES.* 
By the Rev. Churchill Babington, B.D., F.L.S., and W. Mitten, Esq., A.L.S. 
Susorper I. GYMNOCARPI. 
Trıer I. PARMELIACEZA. 
- Gen. I. USNEA, Ach. et Auctt. 
1. Usnea barbata (Fries, Lich. Eur. p. 18; Bab. in Hook. Fl. N. Zeal. part 2. pp. 268, 269). 
Has. Abundant everywhere, and infinitely variable. 
* The following Lichens are for the most part found in New Zealand as well as in Tasmania. Reference is 
accordingly made to the New Zealand Flora for the synonymy under the species here enumerated, when the plant 
occurs there also. In that work various remarks on the species, especially on the geographical distribution, will be 
found, which will not be repeated in this enumeration. The crustaceous Lichens are described by Mr. Mitten.— C. B. 
