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EXPLANATION OF TERMS. 



Annulus inferus. In Hymenomycetes : 

 collar attached to the stipe below the 

 apex formed by rupture of marginal veil 

 round the margin of the pileus. See 

 annulus. 



Annulus mobilis. In Hymenomycetes : 

 portion of ruptured marginal veil re- 

 maining as a moveable annular sheath 

 upon the stipe after expansion of the 

 pileus. See annulus. 



Annulus superus. In Hymenomycetes : 

 same as armilla. 



Anther. In Hymenomycetes : old term 

 for cystidium. 



Antheridium. (a) Male sexual organ. 

 (b) In Hymenomycetes : old term for 

 cystidium. 



Anthrax. Disease in animals and man 

 excited by Bacillus Anthracis. 



Aphthae. Same as thrush. 



Apogamy. Loss of sexual function without 

 suppression of the normal product of the 

 sexual act. 



Apotheeium. Same as discocarp. 



Appendicula. In Erysipheae : branching 

 hair-like process at the summit of sporo- 

 carp. 



Archegonium. Female sexual organ with 

 narrow upper portion (neck) pierced by 

 a canal usually enclosing one or more 

 cells (neck-canal-cells) and leading to a 

 basal dilated portion (venter) containing 

 one oosphere (ovum) and a smaller cell 

 at the entrance of the neck-canal (ventral 

 canal-cell). After fertilisation the embryo 

 is developed within the venter. 



Archicarp. Beginning of a fructification, 

 i. e. cell or group of cells fertilised by a 

 sexual act. Same as ascogonium, carpo- 

 gonium. 



Areolate. Marked out into small areas or 

 spaces. 



Armilla. In Hymenomycetes : plaited 

 frill suspended from apex of stipe formed 

 by a layer of tissue separated from the 

 surface of the stipe except at apex, and 

 forming at first a covering membrane of 

 the hymenium, from which it is detached 

 on expansion of the pileus. Same as 

 annulus superus, frill. 



Arthrosporous. In Schizomycetes : spe- 

 cies which have no endogenous spore- 

 formation are arthrosporous. 



Asciferous . Bearing asci. 



Ascocarp. In Ascomycetes : sporocarp 

 producing asci and ascospores ; its three 

 kinds are apothecium or discocarp, peri- 

 thecium or pyrenocarp, and cleistocarp. 



Ascogenous. Producing asci. 



Ascogonium. In Ascomycetes : same 

 as archicarp. 



Ascophore. Sporophore bearing an ascus. 

 See sporophore. 



Ascospore. Spore formed in an ascus. 

 Same as thecaspore. 



Ascus. In Ascomycetes : large cell, usually 

 the swollen extremity of a hyphal branch, 

 in the ascocarp within which spores 

 (typically 8) are developed. Same as 

 theca. 



Ascus-apparatus. In Ascomycetes : 

 portion of the sporocarp consisting of 

 the asci together with the ascogenous 

 cells. 



Ascus suffultorius. Corda's term for 

 basidium. 



Autoecious. A parasite which goes through 

 the whole course of its development on a 

 single host of a particular species is 

 autoecious. Same as autoxenous. 

 Comp. metoecious, lipoxenous. 



Autoxenous. Same as autoecious. 



Axile. In the axis of any structure. 



Azygospore. In Mucorini : apogarriously 

 formed spore resembling a zygospore. 



Basidiogenetic. Produced upon a basi- 

 dium. 



Basidiophore. Sporophore bearing a 

 basidium. See sporophore. 



Basidiospore. Spore acrogenously ab- 

 jointed upon a basidium. 



Basidium. Mother-cell from which spores 

 are acrogenously abjointed. Same as 

 ascus suffultorius, sterigma. 



Basipetal. In the direction of the base. 

 Comp. acropetal. 



Basiscopic. Looking towards the base, 

 i.e. on the side towards the base. Comp. 

 acroscopic. 



Bion. An individual morphologically and 

 physiologically independent. 



Blastema. Wallroth's term for the lichen- 

 thallus. 



Brood-bud. (a) In Lichens : same as 

 soredium. (b) In Archegoniatae : same 

 as bulbil. 



Brood-cell. Propagative cell, naked or 

 with a membrane, produced asexually, 

 separating from the parent and capable of 

 developing directly into a new bion. 

 Same as gonidium, conidium. It passes 

 without demarcation into the brood- 

 gemma and bulbil. 



Brood-gemma. Pluricellular propagative 

 body without differentiation, produced 

 asexually, separating from the parent 

 and capable of developing directly into a 

 new bion. Same as gemma. It passes 

 without demarcation into the brood-cell 

 on the one side, and into the bulbil on 

 the other. 



Bulbil, (a) In some Fungi doubtfully 

 considered Ascomycetes : small pluri- 

 cellular bodies incapable of germination. 

 (b} In Archegoniatae : deciduous leaf- 



