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19. 
20. 
foie 
PLEX 
22. 
24. 
25. 
144 
Filaments shewing plurilocular sporangia and method of 
branching in LEctocarpus confervoides. X 240. 
Part of a plant of Ectocarpus fasciculatus var. refracta with 
plurilocular sporangia. xX 240. 
Cell-organisation of Ectocarpus fasciculatus. X 2000. 
Prare 1k 
A section of a young plant of Ulonema rhizophorum from the 
thallus of Rhodymenia palmata. xX 800. 
Cell-organisation of Ectocarpus simplex. X 1500. 
The distal end of a filament of Ectocarpus simplex shewing 
attenuation when compared with Figs. 11 and 12. X 240. 
Surface view of margin of disc of young plant of Ulonema 
vhizophorum. xX 800. 
Filament of Ectocarpus simplex with plurilocular sporangia. 
xX 240. 
Ectocarpus simplex with unilocular sporangia. xX 240. 
Part of a plant of Ulonema rhizophorum shewing unilocular 
sporangia, paraphyses, rhizoids and part of a mucilage 
hair. XX 1500. 
PraATe XX. 
Ectocarpus terminalis from the surface of a limpet shell, 
shewing “‘innovation’”’ of unilocular sporangia. ™X 360. 
Section from the thallus of Himanthalha lorvea shewing the 
attachment of a young plant of Ectocarpus velutinus with 
unilocular sporangia. X 300. 
Part of a filament of Ectocarpus tomentosus with plurilocular 
sporangia. xX 480. 
Part of a plant of Hecatonema maculans from the fronds of 
Corallina officinalis. Note the intrusion of vegetative 
filaments into empty plurilocular sporangia. XX 400. 
Part of the filament of Isthmoplea sphaerophora with unilocular 
sporangia.  X 240. 
Prare: Xt 
Filaments of Ectocarpus luteolus with plurilocular sporangia, 
from surface of stem of an old frond of Fucus serratus. 
xX AO: 
Cell-organisation of Ectocarpus luteolus. X t000. 
Cell-organisation of Myriotrichia filiformis. X 1000. 
Part of a plant of Myriotrichia filiformis shewing longitudinal 
division of cells to form lateral branches of definite and 
indefinite growth and unilocular sporangia. xX 240. 
Part of a plant of Eciocarpus fasciculatus forma a with 
unilocular sporangia. x 240. 
A section through the thallus of Fucus serratus shewing the 
basal part of a plant of Ectocarpus luteolus. X. 240. 
Part of a plant of Ectocarpus fasciculatus SESE ieee wae 
plurilocular sporangia. Xx 240. 
ee eee 
