. Text-book of structural and physiological botany . Fig. io.—Tabular cellfrom the epidermis ofCallitriche. Fig. II.—Irregularly stellate cell: a uni-cellular Alga, Euastru77t crux-neliten-sis. ( X 400.) example, is from 0*001 to 0*002 mm. broad and long;the diameter of pollen-grains, which also consist of a singlecell, varies between o*i and 0*0075 mm.; the lignified cellsin the wood of the oak i^Quercuspedicellata) have an averagelength of about 0*7 mm., and those in the trunk of the silverfir, Abiespedinata, one of from 2 to 3 mm. There are, how-ever, cells of a considerably larger size, es
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. Text-book of structural and physiological botany . Fig. io.—Tabular cellfrom the epidermis ofCallitriche. Fig. II.—Irregularly stellate cell: a uni-cellular Alga, Euastru77t crux-neliten-sis. ( X 400.) example, is from 0*001 to 0*002 mm. broad and long;the diameter of pollen-grains, which also consist of a singlecell, varies between o*i and 0*0075 mm.; the lignified cellsin the wood of the oak i^Quercuspedicellata) have an averagelength of about 0*7 mm., and those in the trunk of the silverfir, Abiespedinata, one of from 2 to 3 mm. There are, how-ever, cells of a considerably larger size, es