The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . Fig. 244. Verltcal Bection of the disk-like receptacle of Livenvort {Marchantia), showinganthcrldia a, a In Ita eubstunce. These antheridia are flask-shaped sacs con-TftlmnR phytozoary cells. They communicate with the upper surface, andtheir coitents are discharged tlirauph It. Between the antheridia there areair cavities c, c, connected with stomata i, s. development of Lycopodiacese we have parts which areanalogous to those of the stamens in Phanerogams. Themicrosporangium evidently corresponds to the po
The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . Fig. 244. Verltcal Bection of the disk-like receptacle of Livenvort {Marchantia), showinganthcrldia a, a In Ita eubstunce. These antheridia are flask-shaped sacs con-TftlmnR phytozoary cells. They communicate with the upper surface, andtheir coitents are discharged tlirauph It. Between the antheridia there areair cavities c, c, connected with stomata i, s. development of Lycopodiacese we have parts which areanalogous to those of the stamens in Phanerogams. Themicrosporangium evidently corresponds to the pollen-sac,and the microspores are the equivalents of the pollen-grains,—the forms seen in such Gymnosperms as Cycad-acese being the link connecting them with the highest Fig. 249. Fig. 250. Fig. 247. Flo. 245.—Spore *, of a Fern (Pteris hmji/oHa) sprouting, giving off a root-likeprocess, r, and a flat cellular expansiott, p, called the prothallus or this expansion antheridia and pistillidia are said to occur<IG. 246.—Fructification of Club-Moss (Lycopodium), situated in the axil of aleaf, I. It consists of a case minute cellular bodies, which are dis-charged in the form of powder,fto. 247.—Fructiticatisu of a Club-Moss {Lycopodimn clanatum). The branch iscovered with minute pointed leaves, /; from rt proceeds a stalk bearing at itsextremity two spikes,/, consisting of modified leaves, with 248.—One of the cases separated from the axil of the Club-Jloss leaf, opening by two valves, and discharging the minute I-ycopod powder (microspores),^lo. 249.—The small spore of a Rhizocarp (Pi/ularia (jlobuU/era, Pillwort). TheInner coat is protruded, and the outer coat has burst so as to discharge cellul
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
