| 释义 |
acervulus|əˈsɜːvjʊləs|
[mod.L. (S. T. Soemmerring 1793, in C. F. Ludwig Scriptores Neurologici Minores III. 323), dim. of L. acervus heap: see -ulous.]
†1. Anat. In full acervulus cerebri: = brain-sand s.v. brain n. 6. Obs.
1806A. Fyfe Anat. Human Body (ed. 2) II. 15/1 Near, or in the Substance of the Pineal Gland, small Calcareous Concretions are sometimes found, called, by Soemmerring, Acervulus Cerebri, from their being generally found collected in a heap. 1882Quain's Elem. Anat. (ed. 9) II. 327 The follicles [of the pineal]..often contain..much gritty calcareous matter (acervulus cerebri, brain sand), composed of microscopic particles.
2. Bot. A flat mass of fungal conidiophores embedded in the tissue of the host plant.
1872W. A. Leighton Lichen-Flora Gt. Brit. (ed. 2) p. xvi, Acervuli, little heaps or clusters. 1931Clements & Shear Genera of Fungi 196 Melanconiaceae..Strata typically bearing simple or ramose basidia upon which the conidia arise, forming acervuli or masses, which are immersed or erumpent. 1947C. E. Skinner et al. Henrici's Molds, Yeasts, & Actinomycetes (ed. 2) v. 96 The third order, the Moniliales.., contains the remaining forms, whose conidiophores are produced neither in pycnidia nor upon acervuli, but are formed from superficial hyphae over the entire surface of the fungus colony. 1972E. Moore-Landecker Fundamentals of Fungi v. 139 Conidiophores may be produced as part of a distinct nonsexual fructification that resembles an ascocarp. These include the acervulus, an open mass of closely packed conidiophores which may form a flat discoid cushion of spores. |