epitheciumn.
/ɛpɪˈθiːʃɪəm/ Botany.
The surface layer of the fruiting body in certain lichens and fungi.
ΚΠ
1879 W. A. Leighton Lichen-flora (ed. 3) p. ix The paraphyses are slender filaments..which, by their close proximity, constitute the disk or epithecium.
1921 A. L. Smith Lichens iv. 158 In some genera [of lichens] there is a profuse branching of the paraphyses to form a dense protective epithecium.
1952 C. J. Alexopoulos Introd. Mycol. xii. 290 In some apothecia, the paraphyses..have their tips united above the asci, forming a layer we call the epithecium.
Derivatives
epiˈthecial adj.
ΚΠ
1967 V. Ahmadjian Lichen Symbiosis ii. 17 Some lichens have algal cells within their fruiting tissues..either hymenial or epithecial algae, depending on their location within the fruiting body.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018).
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