rhizine

...Isidia and lobules are club- or spatula-shaped projections with a cortex, algal layer, and medulla. Rhizines are collections of hyphae from the hypodermis on the underside of the lichen, which serve to anchor the lichen to the substrate, but do not develop vascular tissue. Umbilicus are hard, umbilicus-like bundles of hyphae that have the same origin as rhizoids and are unique to the Cercospora lichens. ...

*Some of the terminology explanations that mention "rhizine" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…裂芽isidiaやロビュールlobuleは棍棒状あるいはへら形の突起で皮層，藻類層，髄層をもつ。仮根rhizineは地衣体裏面の下皮層の菌糸がのびて集まったもので，地衣体を基物に固定する働きをもつが，維管束組織は発達しない。臍状体umbilicusは仮根と同じ起源をもつ固いへそ状の菌糸束で，イワタケ科地衣に特有である。…

※「rhizine」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報