| 单词 | palmella stage |
| 释义 | > as lemmaspalmella stage 2. A phase in the life cycle of various single-celled algae or unicellular flagellates during which they divide by fission to form colonies of non-motile cells within a mucilaginous matrix (formerly supposed to be species of Palmella: see sense 1); an organism in this stage of its life cycle; the colony thus formed. Frequently attributive, esp. in palmella stage [after German Palmellen-Zustand (L. Cienkowski 1876, in Bot. Zeitung 34 17)] . ΚΠ 1876 Jrnl. Bot., Brit. & Foreign 14 245 (heading) The Palmella-state of Stigeoclonium. 1909 A. Willey & S. J. Hickson in E. R. Lankester Treat. Zool. i. i. 156 It is difficult to distinguish this phase of life (the ‘palmella-stage’ as it is called) from a true plant under the terms of our definition. 1967 Oceanogr. & Marine Biol. 5 219 During the periods in which the medium is unfavourable..these palmella [sic] cease dividing. 1989 Encycl. Brit. V. 902/2 Some genera [of the protozoan order Heterochlorida] may be amoeboid during part of the life cycle; others may include a palmella stage. < as lemmas |
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