254 THE PHENOMENON OF 



age, and, according to the researches of an anonymous* 

 author, sprout forth as Httle utricular protrusions from 

 the cells of the surrounding tissue, and penetrate through 

 the thin-walled canals of the dots into the vessels. In 

 these thylls, which appear quite as true, partial, and local 

 Rejuvenescences of the cells, nuclei are formed at a time 

 when those of the mother-cell have long since vanished, 

 never becoming renovated. 



2. Shutting-off of a daughter-cell in the domain of 

 fructification. The shut-off and detached daughter-cell 

 becomes a spore, while the mother-cell remains vegetative. 

 This case doubtless occurs in the spore-formation of many 

 Fungi, particularly the true Hymenomycetes,f many 

 Gasteromycetes, I and most Hyphomycetes.§ 



The multiplication of the cells in the Algal genus 

 Exococcus (Nageli, 'Algensyst,' 169) SLaAViiQ fermentation 

 Fungi, II also takes place by the shutting off, and fre- 

 quently complete tying-off (Abschniirung) of either 

 terminal or laterally budding daughter-cells. But as all 

 the cells are of like character here, these cases would be 

 more properly referred to the domain of vegetative cell- 

 formation. 



c. Reconstruction, with division into four 

 DAUGHTER-CELLS. — From the pregnant discoveries of Ad. 

 Brongniart^ and H. v. Mohl,** on the formation of the 



* ' Untersuoh. lib. die Zellenartig. Ausfullimg. der Gefiisse,' (' Bot. Zeit.,' 

 1845, pp. 225, 241, t. ii.) 



f See Plioebus, 'Ub. der Keimkornerapparat. der Agaricen,' &c,, 'Nov. 

 Act. Nat. Cur.,' xix, 11, (1842,) p. 1?1, t. 56, 57. Corda, 'Ic. Fung.,' iii, 

 t. 7—9 ; iv, t. 10, figs. 134—1 39 ; v, 1. 10. 



X See Tulasne, ' De la Fruotifioation des Scleroderma comparee a celle des 

 Lycoperdon et Bovista,' 'Ann. des So. nat.,' 17, (1842,) p. 5, t. 1, 2, 'Sur 

 les Genres Poli/sacciim et Geaster,' ibid. 18, (1842,) p. 129, t. 6. 



§ See SoMeiden, 'Grmidz.,' ii, pp. 38, 39, figs. 106, 107, ('Principles,' 

 pp. 153, 154, figs. 122, 123; Corda, 'Ic. Fung.,' ii. t. 10, fig. 68, {Verti- 

 cillium,;) iii, t. 1, fig. 28, (Botrytis) ; iv, t. 10, fig. 132 {Isaria). 



II See SaccJiaromyces Cerevisia, in Meyen, 'Pflanzen-phjsiol.,' iii, p. 455, 

 t. X, f. 22. ^ 



^ ' Sur la Gen&ation et le D^veloppement de I'Embryon,' ' Ann. des Sc. 

 nat.,' 1827. 



** 'Ueb. der Ban und die Form der PoUenkorner,' (1834); 'Ub. die 

 Entwicklung und den Bau der Sporen der Kryptogamische Gewachse,' 

 ('Flora,' 1833,) 'Vermischte Schriften,' p. 67. 



