British Mar hie A Igae. 3 1 1 
assimilatory filaments : chromatophores numerous, small, 
disc-shaped : growth basal. 
Bull'll ami a, Batt. Characters of the family. 
Buffhamia speciosa , Batt. Fronds olive-brown, solitary or 
gregarious, attached to the host-plant by rhizoidal filaments, 
more or less gelatinous and lubricous, from a quarter to one and 
a quarter inch long, and about 1 mm. in diameter, filiform, 
tapering to both base and apex, solid ; assimilatory filaments 
(paraphyses) few-celled, cylindrical or slightly club-shaped ; 
plurilocular sporangia linear-oblong or spindle-shaped, stalked, 
as long as or rather shorter than the assimilatory filaments, 
frequently composed of a single row of cells. 
Epiphytic on the fronds of Castagnea Griffithsiana near 
low-water mark ; Weymouth. Fructification in Autumn. 
Myriotrichia densa, Batt. 1. c. 
This species appears to be widely distributed along the 
coasts of Britain, for I have found it at Lamlash and C umbrae 
in the North and Weymouth and Swanage in the South, 
and I believe it to be not uncommon, at any rate in certain 
seasons, all along the South coast. 
In general appearance Myriotrichia densa more resembles 
Litosiphon pusillus than M. clavaeformis , Harv., and I have 
no doubt that it has often been mistaken for that species. 
The mature fronds are cylindrical in outline, and are of 
almost the same diameter from base to apex, with the excep- 
tion of a very small space near the base which is usually bare 
of branches. 
As in the other species of Myriotrichia , the fronds are at 
first composed of a single row of cells which by transverse 
and longitudinal division form a solid axis from which the 
short horizontal branches arise. The branches bear closely 
set, erect, dichotomous or secund ramuli. In a section of the 
frond these radiating branches are seen to be closely re- 
branched, the divisions erect and level-topped, giving to the 
axis the appearance of being surrounded by closely set 
stalked groups of peripheral filaments. 
