单词 | placodioid |
释义 | placodioidadj. Botany. Of a crustose lichen thallus: more or less disc-shaped, with lobes around the edge; (of a lichen) having such a thallus. ΘΚΠ the world > plants > particular plants > lichen > [adjective] > of or characterized by parts angiocarpous1835 tartareous1839 nucleiform1840 gonidial1845 variolarioid1845 hypothalline1855 gonidic1856 gymnocarpous1856 isidioid1856 gonimic layer1857 nucleiferous1857 glebulose1866 heteromerous1875 homoeomerous1875 crustose1879 scyphose1879 apothecial1882 soredial1882 placodioid1911 isidial1921 isidiate1959 1911 A. L. Smith Monogr. Brit. Lichens II. 362 Placodioid, like the genus Placodium, with the thallus orbicular, adpressed, lobed at the circumference. 1921 A. L. Smith Lichens iii. 80 A frequent type of squamulose thallus is that termed ‘placodioid’, or ‘effigurate’, in which the squamulose character is chiefly apparent at the circumference. 1970 U. K. Duncan Introd. Brit. Lichens 148 B[uellia] canescens... Thallus white to grey, usually darker and arcolate in the centre, lighter and placodioid towards the circumference. 1986 New Phytologist 103 786 Intraparietal haustoria were detected in the more evolved placodioid, squamulose, foliose and fruticose lichens. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < adj.1911 |
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