The book A Text-Book of Elementary Botany was written by author Kellerman, William Ashbrook, 1850-1908 Here you can read free online of A Text-Book of Elementary Botany book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text-Book of Elementary Botany a good or bad book?
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In our common her- baceous and woody plants there may be found three distinct systems, namely, the epidervial, the woody strands, and the fundamental tissue. The first of these includes the epider- mis, the hairs and scales, and the stomates. The epider- mis (Fig. 101) is the external compact layer of cells, pro- tecting the more delicate tissue below. Outgrowths of the epi- dermal cells form hairs. These may be one-celled or they may become several-celled ; they may be simple or become branche...d ; sometimes they are glandular at the tip. The general function of the hairs is to protect the parts on which they grow, but in special cases they have other duties to perform ; for example, the rhizoids (root-hairs) absorb food from the soil. Scales are composed of many cells, and like the hairs, they represent modified epidermal cells. 10. The stomates are very small openings through the epi- dermis. They are popularly spoken of as " breathing pores," since the oxygen, as well as other gases, passes through them.
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