Effect of Initial Shoot Size on Growth Rates of Five British Grassland Bryophytes

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Abstract
Relative growth rates of six different size classes of shoot cuttings were compared for five calcareous grassland bryophytes. The experiment demonstrated significant differences among relative growth rates as measured by changes in dry weight and shoot elongation. The rate of dry matter production was not significantly affected by initial shoot length. Shoot elongation behaved differently, however, showing a significant inverse relationship between initial shoot length and relative rate of elongation. It is recommended that estimations of growth responses of bryophytes should include measures of dry weight as well as of stem elongation. The bryophytes studied in this investigation were Brachythecum rutabulum (Hedw.) B.S.G., Lophocolea bidentata (L.) Dum., Plagomnium undulatum (Hedw.) T. Kop., Pseudoscleropodium purum (Hedw.) Fleisch, and Thuidium tamariscinum (Hedw.) B.S.G.

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