acrogenousadj.
/əˈkrɒdʒᵻnəs/, /əˈkrɒdʒn̩əs/, U.S. /əˈkrɑdʒənəs/ 1. Chiefly Botany. Designating or characterized by growth at terminal branches; acrogenic. Now rare.
ΚΠ
1835 J. Lindley Key to Struct., Physiol., & Systematic Bot. iv. 13 In Acrogenous plants no other stem is formed than what arises from the simple union of the bases of the leaves to the original axis of the bud.
1848 J. D. Dana U.S. Exploring Exped.: Zoophytes (new ed.) iv. §69. 68 Polyps have an acrogenous growth, and bud periodically as they grow upward.
1866 M. J. Berkeley in J. Lindley & T. Moore Treasury Bot. 14 A few acrogenous Liverworts have the habit of Lichens, but differ totally in structure.
1874 R. Brown Man. Bot. ii. i. 122 There are three great classes of stems, divided, according to their structure, into Exogenous, Endogenous, and Acrogenous.
1908 Trans. & Proc. N.Z. Inst. 1907 40 235 The old dead leaves of certain acrogenous plants.
2. Chiefly Mycology. Esp. of a fungal spore or conidium: borne at the tip of a hypha or conidiophore. Cf. acrospore n.
ΚΠ
1851 Ann. & Mag. Nat. Hist. 8 119 Sphæria Laburni possesses three kinds of reproductive organs, viz. normal endothecal spores, acrogenous spores very like the fruit, and lastly other spores [etc.].
1871 M. C. Cooke Handbk. Brit. Fungi II. 614 Spores heterogeneous, acrogenous, fusiform, or cylindrical.
1922 Amer. Acad. Arts & Sci. 57 298 Zygospores with or without specialized envelopes: thick walled acrogenous non sexual chlamydospores.
1965 J. W. Wilson & O. A. Plunkett Fungous Dis. Man (1970) xxix. 363 Conidia acrogenous, singly one after another, but remaining attached and forming a head by apical growth.
2003 J. R. White et al. Clavicipitalean Fungi x. 250 They found that the first conidium is acrogenous.
This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).
<
adj.1835