1899] DEVELOPMENT OF HOLDFASTS OF FLORIDEZ 263 
Figs. 10-23. Ceramium rubrum (Huds.) C. Ag. 
Fic. 10. Germinating carpospore 2 days after sowing. X 633. 
Figs, 11-17. Plantlets from 3 to 8 days old ; in figs. 75, 76 only the basal 
cells and primary rhizoids are shown. X 400. 
Fig. 18. Plantlet found growing on Polysiphonia. X 400. 
Figs. 19, 20. Plantlets 9 days old. X 400. 
Fic, 21. Plantlet growing on Polysiphonia. X 400. 
Fig, 22, Plantlet 5 days old, showing early branching of the primary 
thizoid. X 400. 
Fic. 23. Holdfast of a rather young plant. X 213. 
Figs. 24-28. Ceramium strictum (Harv). 
Fic. 24. Carpospore 36 hours after it was sown. X 400. 
Fig.25. Plantlet 3 daysold. X 233. 
Figs. 26,27. Plantlets about 7 days old. X 400. 
Fig, 28, Primary root-cell and disk of mature plant. X 400. 
: ag 29-32. Callithamnion Borreri Ag., plantlets from 2 to 6 days old. 
FIG. 33. C. Borreri, plantlet showing basal cell and rudimentary disk, 6 
days old, x 213. 
Fi. 34. C. Borreri, primary disk of plantlet g days old. X 333- 
Pie. 35. C. Baileyi Hary., mature holdfast, in optical section. X 213. 
) Fics, 36, 37. C. Borreri, base of plantlets 6 days old, each showing pri- 
May disk. X goo, 
F * 
ay 38. C. Borreri, plantlet 6 days old. X 213. 
mg © Boiley:, a portion of a mature holdfast. X 100. 
Ne 4. Spermothamnion Turneri Aresch., branch with clasping disk. 
F 
ie Gal. S. Ti urnert, plantlet 6 days old; nine cells of the filament are 
Ee Tepresented, x 213 
Figs, 
42, 43. S. Turneri, mature holdfast. X 213. 
