a. Bot. [f. EX- priv. + ANNUL-US + -ATE2.] Having no annulus or ring round the sporangium, as certain ferns; opposed to ANNULATE.
1861. Bentley, Bot., 369. Those in which the ring is absent are said to be exannulate.
1880. Gray, Struct. Bot., x. § 2. 361. Not dehiscent, exannulate.
