Text-book of structural and physiological botany . Fig. 393,—I. Agaria^s rubescens ; the receptacle (natural size) ; .? stipes ; v velumuniversale, a velu7npartiale or annulus. II. Part of a longitudinal sectionthrough the hymenium of another species : a pseudo-parenchynia ; b hymenuim ;c spores, (x 400.) 266 Structural and Physiological Botany, the conceptacles or perithecia^ usually opening outwards bya small orifice, the simple internal cavity of which is almostcompletely filled up by the soft hymenium (Fig. 395). The reoroductive cells are either the result of a process Fig. 394.—Truf
Text-book of structural and physiological botany . Fig. 393,—I. Agaria^s rubescens ; the receptacle (natural size) ; .? stipes ; v velumuniversale, a velu7npartiale or annulus. II. Part of a longitudinal sectionthrough the hymenium of another species : a pseudo-parenchynia ; b hymenuim ;c spores, (x 400.) 266 Structural and Physiological Botany, the conceptacles or perithecia^ usually opening outwards bya small orifice, the simple internal cavity of which is almostcompletely filled up by the soft hymenium (Fig. 395). The reoroductive cells are either the result of a process Fig. 394.—Truffle, Tiiber iiielanosporuin \ I. receptacle (the part that is eaten);II. a part of the receptacle, with spores in different stages of maturity, theouter cortical layer below (strongly magnified) ; III. sporangium with two spores(more strongly magnified). of impregnation or not ; in the latter case they are calledsimple spores^ and their mother-cells sporaitgia ; in theformer case differdnt names aregiven to them according to theirmode of formation. Reproduction by spores is byfar the most common mode amongFungi. The spores, however, varygreatly in their form and mode offormation; in some species two,three, or even four forms have beenobserved, forming a single cycle ofFig. 395. — Nectria inaicrata development. Their modc of form- (Sphseriaceae) : a mature pen- . ... ..,,._- thecium; b spore-sacs or asci. atiou IS of three principal diTierent (x about 150.) , . , ^ kinds :—
Size: 1941px × 1288px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyorkjwileysons
