exindusiateadj.
/ˌɛksɪnˈdjuːzɪət/, /ˌɛksɪnˈdʒuːzɪət/, U.S. /ˌɛksᵻnˈd(j)uziᵻt/ Botany.
Of a fern: having sori that lack an indusium. Also: designating sori of this type.
ΚΠ
1864 F. von Mueller Vegetation Chatham Islands 69 Some varieties of this fern, as indicated by Dr. Hooker, bear great resemblance to the exindusiate form of Nephrodium velutinum.
1911 Amer. Fern Jrnl. 1 35 We find very often that two forms, which can scarcely be distinguished by any other character, differ from each other only by the one being indusiate, the other exindusiate.
1941 Rhodora 43 218 Sori exindusiate, roundish in outline, and dorsal on the veins.
2006 M. G. Simpson Plant Systematics iv. 88/1 The family Polypodiaceae are largely distinguished in being exindusiate (sori lacking an indusium), whereas other families, such as the Pteridaceae, are indusiate (sori having an indusium).
This entry has been updated (OED Third Edition, December 2015; most recently modified version published online March 2022).
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adj.1864