B2. 
BS: 
34. 
35: 
135 
Plant cylindrical, branched; central siphon of very large 
barrel-shaped or spherical cells, covered only by ring-like 
bands of small cells or completely corticated, in which case the 
swollen axial cells give an articulated outline to the plant ; 
tetraspores in whorls, arising in the cortex Ceramium ...p.98 
Plant cylindrical and branched ; with a definite axial row of 
. large cells, but the outline of the plant is not “ beaded ”’ ; 
axial row of ceils covered by a double cortex of larger cells 
within and very small ones on the periphery ; tetraspores not 
in whorls ... abe mae bite as Microcladia ...p.100 
Thallus at first with single axial row giving off whorls of much- 
forked branches ; central axis reinforced later by downwardly- 
growing filaments. (Distinguishable from Nemalion by 
presence of whovled lateral branches) ... Dudresnaya ...p. 100 
Plant cylindrical, branched ; central siphon not clearly shown; 
transverse section shows group of 5-8 large cells surrounded by 
a mantle of smaller cells; plant closely beset with short 
branches attenuated at both ends ae Naccaria ...p.79 
Plant cylindrical, branched ; central siphon not clearly shown ; 
transverse section may show large cell in centre surrounded by 
large number of others which decrease in size towards the 
periphery ; cystocarps in flask-shaped receptacles, terminal on 
short branches ; tetraspores in one or two rows, half immersed 
in special branches, attenuated at bothends Rhodomela ...p.88 
Plant profusely branched, traversed by single axial thread from 
which arise whorls of filaments uniting to form a thick cortex 
of which the outer layer is composed of radially arranged 
branches of equal length, closely adherent to one 
another but separable under pressure ; plant may be hollow 
when old ... Baa bee abe ... Gloeosiphonia ...p.100 
Thallus a shapeless brown-purple membrane, without any 
rigidity ; cells in packets embedded in a colourless matrix ; 
plant has the texture of a deflated indiarubber balloon... 
Porphyva ...p.76 
Plant a minute parasite entirely buried in the tissues of the host 
and causing swellings or pustules on its surface, in which the 
parasite develops reproductive organs ... ane es Ban) 
Very gelatinous worm-like algae, built up of longitudinally 
running filaments from which arise radially arranged cortical 
filaments held together by mucilaginous material ... Se eso) 
Algae of various types of organisation ... Soe sae ee 39 
Parasitic on Rhodomela subfusca ... oe Harveyella ...p.79 
Parasitic on Polysiphonia fastigiata are Choreocolax ...p.79 
Parasitic on Phyllophora Brodiaei or Gymnogongrus Griffithsiae 
Actinococcus ...p. 82 
Parasitic on Ahnfeltia plicata sake Soe Stervocolax ...p.82 
