. The algae. Algae. ,r,rr,rc,C|VC, I 2-5 4-5 10 13 15 cms. APPROX. QUANTITY OF INDIVID. DEPTH OF ALTERNATE LEAVES PRESENT Fig. 202 A, distribution of total epiphytes on successive leaves of Oenanthe fluviatilis. B, C, distribution of Cocconeis placentula on successive internodes of plants of Equisetum Itmosum, well separated (3 stems average), r =less than 5 individuals per o-i sq. mm.; rr = about 5; re = about 10; c = about 30; z;c = about 50. D, distribution of Cocconeis placentula ( ) and Eunotiapectinata ( ?) on crowded plants of Equisetum limosum (3 stems average). E, distribution of Stig
. The algae. Algae. ,r,rr,rc,C|VC, I 2-5 4-5 10 13 15 cms. APPROX. QUANTITY OF INDIVID. DEPTH OF ALTERNATE LEAVES PRESENT Fig. 202 A, distribution of total epiphytes on successive leaves of Oenanthe fluviatilis. B, C, distribution of Cocconeis placentula on successive internodes of plants of Equisetum Itmosum, well separated (3 stems average), r =less than 5 individuals per o-i sq. mm.; rr = about 5; re = about 10; c = about 30; z;c = about 50. D, distribution of Cocconeis placentula ( ) and Eunotiapectinata ( ?) on crowded plants of Equisetum limosum (3 stems average). E, distribution of Stigeoclonium sp. ( ) and Coleochaete scutata ( ) on fairly crowded stems of Equisetum limosum (2 stems average). (After Godward.) same level. These maxima on the lower leaves are to be associated with the diatom flora. It will also be observed that the number of epiphytes on the internodes remains more or less constant, but rapid growth of the substrate, the leaf lamina, tends to prevent colonization by epiphytes. The density of epiphytes that are at- tached to dead organic material is dependent upon the habitat of the substrate, if it is floating then there are few epiphytes, if it is attached or submerged the epiphytes are numerous, whilst if it is lying on the bottom the epiphytes will be few. The various species to be found are all a residuum from the last living state of the material, and the assertion that dead material bears more epiphytes than living does not appear to be correct in this case, and it can only be supposed that it arose in the past through lack of quantitative analysis. In some cases the appearance of epiphytes is due to change 372. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
