336 FLORA OF TASMANIA. [Alge, by W. H. Harvey. 
branch. The ramuli are very robust, sparingly or copiously divided, the tips of their divisions mucronate. Sub- 
stance rather rigid. Colour a deep red. 
13. Callithamnion elongatum (Harv.) ; frondibus fusco-purpureis dense ceespitosis basi intertextis 
longissimis setaceis e basi pellucide articulatis dichotome compositis et ramis alternis obsitis, ramis minori- 
bus secunde alterne v. dichotome ramosis versus apicem ramulos crebre dichotomos ferentibus, articulis 
superioribus diametro 4—5-plo longioribus, inferioribus longioribus, tetrasporis triangule divisis ad genicula 
ramulorum fasciculatis breve pedicellatis, favellis versus apices ramulorum solitariis.—Harv. Alg. Austr. 
Ersic. n. 534. 
Has. Georgetown, not uncommon. 
DisrRrB. South coast of Australia. 
Fronds in large bundled tufts, often upwards of a foot in length, setaceous, not much attenuated upwards, the 
principal stems towards the base twisted round each other into ropes, which strengthen the tuft. The whole branch- 
ing is on a dichotomous type, but by suppression, it is very irregular, a compound of the alternate, secund, and 
dichotomous. The penultimate divisions throw off from their sides short, multifid, or regularly dichotomous ramuli, 
which bear fructification of both kinds, on different individuals. The favelle are usually solitary; the tetraspores 
several together, tufted or somewhat whorled round the nodes of the ramuli. Colour a dark brownish-purple, some- 
times rather brighter. Substance somewhat gelatinous, but firm, like that of Griffithsia setacea. 
14. Callithamnion Griffithsioides (Sond.); cespitosum, coccineum, frondibus basi intertextis seta- 
ceis pellucide articulatis dichotomis fastigiatis, ramis pluries furcatis, axillis acutis versus apicem ramulos 
minutos multifidos ferentibus, ramulis crebre ramulosis fere corymbosis fructiferis, tetrasporis prope apices 
ramulorum fasciculatis pedicellatis, articulis cylindraceis diametro 6-8-plo longioribus.—C. Griffithsie, 
Harv. Alg. Austr. Exsie. n. 535. 
Has. Georgetown, rare, Gunn. 
Disrris. Port Phillip, D. Mueller, W. H. H. 
Tufts dense, 4-5 inches long, fastigiate, bright-crimson, in habit resembling those of Grifithsia setacea. The 
branching is pretty regularly dichotomous, the forks rather distant, and the branches and their divisions consequently 
naked, except at the extremity, where the branch (of fertile specimens) ends in a minute, corymbose, multifid ramu- 
lus that bears the tetraspores.—The species is nearly related to the preceding, but I think distinct. 
15. Callithamnion fastigiatum (Harv.); fronde pellucide articulata (1-2-unciali) sursum atte- 
nuata decomposita dichotome fastigiata, ramis repetite furcatis erecto-patentibus, ramulis ultimis ad geni- 
cula minute spinulosis v. gemmiferis, articulis omnibus diametro sub-4-plo longioribus, favellis subbinis 
nudis ad axillas ramorum, tetrasporis cruciatim divisis ad genicula ramulorum sessilibus sepe oppositis 
nunc solitariis nunc 2-3-fasciculatis. 
Has. Georgetown, Gunn. 
Frond very slender, 1-2 inches high, flabelliform and nearly regularly dichotomous and fastigiate, rose-red. 
The nodes of the upper or ultimate ramuli are generally furnished with minute, bud-like or somewhat spinous pro- 
cesses, which perhaps afterwards develope into tetraspores. The tetraspores are oval, and cruciately divided.—In 
habit this somewhat resembles Ceramium fastigiatum, but in softness of substance, ramification, ete., it has more the 
character of a very slender Grifithsia. 
: 16. Callithamnion botryocarpum (Harv,); nanum, penicillato-cespitosum, fronde minuta (1-2 
lineas alia) e basi ramosissima, ramis alternis v. secundis patentibus flexuosis nunc subsquarrosis, articulis 
diametro 4-plo longioribus, tetrasporis magnis triangule divisis in glomerula ad axillas ramorum densissime 
