ALGÆ TASMANICÆ, 409 
Has. George Town, Mr. Gunn, 1301. 
79. Rhabdonia nigrescens, nobis ; fusco-rubra, siccitate ni- 
grescens, froude setacea decomposite ramosissima rigida, 
ramis iterum divisis erecto-patentibus, ramulis basi angus- 
tatis acutis. 
Has. Tasmania, Mr. Gunn.—A more slender, dil far more 
rigid plant than the last, and of a much darker colour ; 
but in other respects nearly allied. Their aspect is very 
different, and yet it is not easy to fix on a good specific 
distinction, 
Fam. 6. CERAMIEÆ, J. Ag. 
80. Thamnocarpus Gunnianus, Harv. in Hook. Ic. Pl. t. 662. 
Has. Port Arthur, Mr. Gunn. 
81. Thamnocarpus ? Laurencia, nobis; purpureo-coccinea, 
fronde cartilaginea filiformi basi cylindracea apicem versus 
subcompressa ramosissima, ramis alternis erecto-patentibus 
distichis iterum divisis ramulis lanceolatis. 
Has. George Town, Mr. Gunn.—Until the fruit of this 
plant be end. its position must be considered doubtful. 
The structure of the stem is icd similar to that of the 
Thamnocarpi. 
82. Thamnocarpus Ptilota, nobis ; fronde plano-compressa 
lineari. costata vage pinnatim ,composita disticha, ramis | 
erectis ancipitibus pinnatis bipinnatisve, pinnulis basi vix - 
angustatis erectis falcato-ineurvis sæpe secundis, glandulis 
. marginalibus, favellis pedicellatis minutis involucratis, in- 
volucri ramulis simplicibus incurvis. CET 
Has. Port Arthur, Dr. Jeannerett, Dr. Lyall. In habit this | 
erty resembles a Ptilota, especially P. corallina; but a 
the structure of the stem is different ; in the fs 2 
re is very little difference. ae 
83. Ptilota articulata, J. Ag. in Linn. p. 36. 
AB. Tasmania, Mr. Gunn. P uns 
. 94. Spyridia filamentosa, Harv. l. c. p 449. E. 
: Has. T Tasmania, common, Mr. Gunn. — 
55: Ceramium rubrum, Agnes hep. tet 
