262 _ BOTANICAL GAZETTE [octossr 
PLATE XXII, 
Figs. 1-10, Polysiphonia violacea (Roth) Grev. 
Fic. 1. Plantlet growing on Scytosiphoul omentarius Ag. X 400. 
Fig. 2. Plantlet 3 days old. X 400. 
Fig. 3. Plantlet 9 days old. X 400. 
Fics. 4, 5. Plantlets 12 days old. x 233. 
Fic. 6. Holdfast showing rhizoids springing from corticating cells. X 54. 
Fic. 7. Plantlet 12 days old. x 213. 
Fic. 8. Clasping disk of rhizoid of plant growing on Zostera marina. 
X 400. 
Figs. 9, 10. Plantlets 9 and 11 days old. X 400. 
FIGs. 11-29. Spyridia filamentosa (Wulf.) Harv. 
Fig. 11. Carpospore. X 400. 
Figs, 12-18. Plantlets from 2 to 12 days old. x 400. 
FIGs. 19-23. Bases of plantlets, showing primary cells and clasping disks. 
X 400. 
FiG, 24. Base of rhizoidal branch (c. of fig. 28). X 213. 
Fig. 25. Edge of mature holdfast, in optical section. X 157: ; 
Fig. 26. Transverse section of frond, showing that the origin of rhizoidal 
branches is in the corticating cells; somewhat magnified. 
Fig. 27. Procumbent branch, near 78a, with rhizoidal outgrowths ssi 
central cell. x 333. 
Fig. 28. Creeping branch, slightly magnified. 
F1G, 29. Uncorticated secondary rhizoid with disk. X 333- 
Figs. 30-43. Dasya elegans (Martens) C. Ag. 
Figs. 30, 31. Germinating tetraspore. X 400. 
FIG. 32. Segmenting carpospore 2 days old. X 400. 
Figs. 33-35. Segmenting tetraspore. X 400. 
Figs, 36-38. Plantlets 12 days old, resulting from the 
tetraspores. x 400. 
Figs. 39-42. Plantlets 17 days old, resulting fr 
Carpospores ; figs. 79, 42 show only the root-cell and disk. X 49% 
FIG. 43. Portion of mature holdfasi, in optical section. X 233 
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PLATE XXIII. ing 108 she . 
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Figs. 1-9. Dasya elegans (Martens) C. Ag. Plantlets se root-cell and 4 
germination of carpospores; in some cases only the prim 
disk are shown; from 12 to 20 days old. X400. 
