42. 
43. 
44. 
45. 
137 
Thallus soft, clinging to the fingers when lifted out of the water ; 
branches of unequal length but not regularly long and short... 
Plumaria ...p.97 
Thallus covered with short spine-like, opposite branches in one 
plane; cystocarps terminal on short lateral branches 
Bonnemaisona ...p.88 
Thallus with a prominent midrib and a narrow labial wing on 
each side, markedly reduced in the axils of branches ... Bae 
Delesseria alata ...p.87 
Thallus not conspicuously differentiated into midrib and lateral 
wings see ou “is ee eae ane Ba ee was 
Small plants with fronds 1-2 inches long, dark in colour ; longi- 
tudinal section of younger parts of the fronds shows a central 
group of elongated cells a vie 506 GNMAUTO. on Do SO 
Thallus of solid texture, dark red in colour, quarter to half an 
inch in width; several sharply marked teeth on each 
pinnule sis dink a ek ... Odonthalia ...p.89 
Thallus with narrow segments, the ultimate ones arising uni- 
laterally like the teeth on a comb; zonately divided tetra- 
spores in special marginal clusters of branches Plocamium  ...p. 86 
Narrow ribbon-like, much divided thallus, beset with numerous 
short, lateral oe a sometimes distended into oh eee 
swellings uae 5 bss Sphaerococcus ...p. 83 
Substantial fronds with cia ended lateral branches but not 
conspicuously narrow insertions ; transverse section circular 
or ovoid in outline... sins ss .. Lauvencia ...p.89 
Stem beset with numerous irregularly lobed leaf-like appendages, 
each with conspicuous veinings ; main stem and margins of the 
frond frequently covered with small irregular emergences 
bearing reproductive organs aa ier Phycodrys ...p.87 
Stem short, stout and creeping, bearing conspicuous upright 
pointed “‘ leaves,’ 2-5inches long JDelesseria sanguinea ...p.87 
Thallus ribbon-like with a narrow lamina on each side of the 
mates %,,.. as ‘ i  Delessexwa alata ...p. 87, 
Thallus narrow with seventies ari tertiary branches springing 
from the midribs Delesseria hypoglossum or D. rvuscifolia ...p. 88 
Thallus 4 to 14 inches long, consisting of a flattened ovoid frond 
from the margins of which spring a few (6-12) similar branches 
Lomentaria vosea_ ...p.85 
Plant of extreme leatheriness of texture ; bright red in colour, 
forming single (or few) spoon-shaped blades, 2-6 inches in 
diameter attenuated towards the base aa Dilsea ...p. 100 
Thallus of tough and almost opaque fronds, completely laminate, 
usually without a stem-like ne variously lobed and 
frilled, without veins Yas ee 40 
Thallus expanded into a delicate, Saisie a ingarrepamerb mem- 
brane ; with or without veins; variously divided into lobes 
or m eoemeliiee segments ; sometimes frilled at the margins... 47 
