ADYSETON, ADYSETUM

(Lat.),n, n. _ A?d(a*d)-i?s(u°s)-e(a)"- to*n, Foe cuete A section of the botanical genus Aly um. [L, ÆCIDIACEI (Lat.), n. m. pl. E%a®-e?)-si2d(ki2d)-i2-a(a?)se- (ke?)-i(e). In the old cla ifications of Fungi, a division of the Coniomycetes, including those that are parasitic upon plants and contain a distinct cellular peridium. They comprise the genera Æcidium, Peridermium, Restelia, ete. [B, 61.] ÆCIDIOLUM (Lat.),n.n. E*(a8-e?)-si2d(ki2d)-i(e)’o-lu’m(utm), À supposed genus of Fungi the members of which are now known to be only the spermogones of other genera. [B, 76.] ZECIDIOMYCETES (Lat.), nm. pl E(a8-e?)-si2d(ki#d)-i?-o-mi- (mu®)-se(kay'tez(te?s). From aixia, a wheal, and wvxys, a fungus, A collective name for the Uredineæ and the Ustilagineæ. [B, 49.} ÆCIDIOSPORF, n. E?s-i2d‘i?-o-spor, For deriy., see Æcrprum and Spore. One of the conidia, or rounded spores, developed in the æcidium stage of Fungi of the order Uredineæ. [B.] See ÆciDium. ÆCIDIUM (Lat.), n.n.?)-si2d(ki?d)'i?-u3m(u‘m). From aixia, a blow with a whip. Ger., Kelchbrand (2d def.). 1. A wheal. [L,46,73.] 2. In botany, a name formerly given to a number of Fungi, supposed to constitute a distinct genus, distinguished by the globose shape of the spores, which are prrenred in little fragile necklaces radiating from a thin cellular base. The forms grou) under this head are now known to be merely stages in the development of certain Carposporeæ (Fungi) belonging to the order Uredinew. The latter, at a certain period of their development (called the æcidium stage), form globular ma es beneath the epidermis of various plants. These ma es consist of an agglomeration of rounded yellowish cells, called æcidiospores, surrounded by a cellular investment called the peridium. By the rupture of the latter the æcidiospores are set free and subsequently develop into a new individual, which then usually pa es into what is called the uredo stage. [B, 19, 75.] See Ureno.— Æ. bérberidis [Per so on]. Barberry rust (or cluster-cups); the æ. stage of Puccinia gram in is, formerly thought to constitute a distinct species of fungus. It forms bright-red rounded spots on the leaves and fruit of the barberry (Berberis vulgar is), containing or an; lored secidiospores, which subsequently develop on wheat, oats, and other cereals, constituting the so-called red rust and black rust. [B, 19, 85, 54,75, 76.] See Puccinia gram in is.