( 58 ) 
Lies exes. 
Lichenes are more numerous than any of the other cryptogamic classes > 
except fungi and marine algae. They cover not only the stems of certai n 
trees in great variety, principally along the coasts, but inhabit also the rocks and 
reefs, which are not reached by the sea. No large forms, however, are to be 
found here, nor any Ramalina or Usnea, which in other moist tropical forests, 
whenever a little elevated, give such a strange wintery aspect to the landscape. 
Also not a single Cladonia or any other terrestrial form has been observed. The 
great profusion of epiphyllous forms, though not rich in species, principally in 
the interior, where the cortical lichens diminish greatly in number of species 
as well as of individuals, is also worthy of notice. 
The number of species found by me may be about 36 or 40 species* 
Amongst them are the genera Opegrapha, Graphis, Lecidea, Parmelia, Lecanora, 
Arthonia, Physcia, Yerrucaria and Trypetelium. 
Alg^e. 
1 observed a few fresh-water Cladophorae of a green colour during the hot 
season on the rocks of the dried-up torrents, but altogether in such a state as to be 
unfit for determination. I found in July a Batrachospermum attached to bamboo 
canes, and fine patches of a Mougeotia in the creeks north of Watering Cove, 
as also an Oscillatoria (?) of a dark-green colour all along the water-courses on 
.Ross Island. 
The number of seaweeds is not so large, as might be expected from 
the numerous reefs and rocks surrounding the coasts. Fucacese are not nume¬ 
rous in species, though some Sargassum exists in great quantity. 
The great number of the very small species, which occur between the various 
splendid and bright coloured corals, were too much entangled amongst each other 
to permit me to collect them free from other substances, so that they might have 
been recognized afterwards in a dried state. 
In the brackish mangrove ditches only two or three green coloured confervas 
were observed floating and submerged. I do not include Diatomaceae and such 
microscopic forms, which can be observed only by the aid of powerful glasses. 
The number of species of Algas brought home by me may be about 34 or 
36. Amongst them appear to be Oscillatoria, Spirogyra, Conferva, Chsetophora, 
Ulva, Codium, Batrachospermum, Turbinaria, and several genera of Corallines. 
The following have been determined by Prof. G. v. Martens, who kindly commu¬ 
nicated to me the names :— 
Phycoseris lobata, Kg.—On sandstone rocks at Camping Bay. 
Enteromorpha intestinalis, Link. var. capillaris, Kg .—In brackish and salt waters 
of the mangrove swamps along South Andaman, 
—-polydados, Kg.— Ross Island, at the jetty very frequent, and cover¬ 
ing the sandstone rocks with an agreeable green. 
Bryopsis tenuissima, Moris .—Camping Bay on sandstone rocks. 
Halimeda discocdea, Dine .—Frequent on coral reefs all along the coasts. 
—opuntia, Soland .—Only ejected from the sea along the beaches, 
Sargassum microcystum, Kg. ?— (Young and uncertain, being destitute of cysts 
and fruits). Very frequent all along the coastson rocks and 
banks, but nowhere in full grown specimens. 
Carpacanthus ilicifolius, Turner , vol.i. t. 51.—TermoMee Island, in deep sea. 
Zonaria Praseri, Greville. Very frequent on sandstone rocks in the sea, especi¬ 
ally at Camping Bay. 
4 
