. Plants and their uses; an introduction to botany . Fig. 317.—Sea-tangle. Transverse section through the outer part of astalk 2 cm. in diameter, »,, showing the darker rind (r, r) containingslime-canals (g, g); and the lighter interior tissue (p, p) which form thegreater l)ulk. (Luerssen.) Fig. 318.—Hladdcr-wrack {Fucus vesiculosus. Wrack Family, Fucacece).Branch bearing air-bladders (/) and swollen tips (s) containing con-ccptades. (Luerssen.)—Brown, slimy, tough seaweed, sometimes 1 , growing attached to rocks, etc., between tides along the NorthAtlantic coast. A comparatively simple
. Plants and their uses; an introduction to botany . Fig. 317.—Sea-tangle. Transverse section through the outer part of astalk 2 cm. in diameter, »,, showing the darker rind (r, r) containingslime-canals (g, g); and the lighter interior tissue (p, p) which form thegreater l)ulk. (Luerssen.) Fig. 318.—Hladdcr-wrack {Fucus vesiculosus. Wrack Family, Fucacece).Branch bearing air-bladders (/) and swollen tips (s) containing con-ccptades. (Luerssen.)—Brown, slimy, tough seaweed, sometimes 1 , growing attached to rocks, etc., between tides along the NorthAtlantic coast. A comparatively simple type is the thread-weed (Nemalion,Fig. 320). The thallus is .small and with slender branches whichgrow at the apex Init do not show much differentiation among thevegetative cells. Male gametangia (/, ^p) are developed at the tips THE RED ALGiE 489 of certain branches, and these emit minute, spherical gameteshaving no flagella or other means of locomotion. At the tips ofother branches female gametes appear, each in the form of a flask-shaped
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
