. Fresh-water biology. Freshwater biology. BLUE-GREEN ALGAE 109 38(37) Filaments forming erect tufts, of ten branched. Symploca Filaments densely interwoven to form a slimy substratum from which arise erect tufts of variable height. Sometimes more or less procumbent. False branches solitary; sheaths thin, colorless, firm or somewhat mucous; apex of the filament straight, sometimes a little tapering; outer membrane of the apical cell slightly thickened in some species. In hot springs, on damp earth, walls, or trunks of trees. 48. Symploca luci/uga Harvey, a, X 250; b, natural size. W
. Fresh-water biology. Freshwater biology. BLUE-GREEN ALGAE 109 38(37) Filaments forming erect tufts, of ten branched. Symploca Filaments densely interwoven to form a slimy substratum from which arise erect tufts of variable height. Sometimes more or less procumbent. False branches solitary; sheaths thin, colorless, firm or somewhat mucous; apex of the filament straight, sometimes a little tapering; outer membrane of the apical cell slightly thickened in some species. In hot springs, on damp earth, walls, or trunks of trees. 48. Symploca luci/uga Harvey, a, X 250; b, natural size. WoUe.) (After 39 (29) Several filaments in a common sheath which is frequently branched Subfamily Vaginakieae . 40 40 (41, 42) Sheaths often colored; lamellose; filaments few or many, loosely aggregated within the common sheath. Schizothrix Kiitzing. Several filaments enclosed in a firm lamellose sheath which is at first colorless but later becomes yellowish, brownish, or purplish; filaments simple or variously branched. Forming cush- ion-hke masses, erect tufts, or a flat stratum on moist substrata, rarely free-floating. Fig. 49. Schizothrix rubella Nigeli. X 430. (After Gomont.) 41 (40, 42) Sheaths hyaline, fused with adjoining sheaths. Hydrocoleum Kiitzing. Filaments composed each of numberless short cells, the end cell with thickened cap-like membrane. Filaments two to many in colorless, slimy sheaths, which become fused with those of adjoining fila- ments. In brooks and water- falls. Fig. 50. Eydrocoleum bomoeotrich- um Kiitzing. X 390. (After Gomont.) 42 (40,41) Sheaths hyaline, not lamellose, containing a large number of filaments Microcoleus Desmazieres. Filaments simple, consisting generally of long cells; closely aggregated in great numbers in the center of a conspicuous, hyaline, cyUndrical sheath. Fig. 51. Microcoleus ddicatulus W. and G. S. West. X 350. (After West.). Please note that these images are extracted from scanned page images that may have been digitally e
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
