114 'SIPHOPHYCE.E. 



Further modes of increase are 



5. Cell division. 



6. Formation of spores. 



7. Formation of zoospores. 



This plant possesses also fivefold resting stages 



1. Of the asexual zoospores laid in water for months. 



2. Of the root cells the year throughout in which they 



originated. 



3. Of the hypnosporanges the year throughout in which they 



originated. 



4. Of the spores for years. 



5. Of the isospores at least over the year in which they 



originated. 

 y L~ V 



Plate LXV., Botrydium granulatum. Fig. 1, plants of the natural 

 size. Fig. 2, zoosporaiigium X 30. Fig. 3, the same, five hours after- 

 wards, with the zoospores escaping at the apex, X 30. Fig. 4, zoospores 

 X 520. Fig. 5, differentiation of the plasma in the root, and the forma- 

 tion of root cells, X 30. Fig. 6, root cells in water producing zoospores 

 X 160. Fig. 7, the resulting zoospores X 520. Fig. 8, the same, 24 hours 

 after swarming, X 520. Fig. 9, the same, four days later, X 520. Fig. 

 10, the same, eight days later, X 520. Fig. 11, copulating swarmspores 

 X 520. Fig. 12, zoospores derived from a spore, after six and a half 

 hours, X 160. Fig. 13, sexual swarmspores in conjugation X 520. Fig. 

 14, isospores, 24 hours old, X 520. Fig. 15, stellate isospores, more than 

 a day old, X 520. Fig. 16, young plant resulting from vegetation of 

 isospore. All after Eostafinski and Woronin. 



Botrydium granulatum. Linn. 



Usually gregarious, often aggregated, rarely confluent ; cells 

 globose, pyriform, size of a poppy seed, or mustard seed, or 

 larger, leek-green, apparently pulverulent. 



Botrydium granulatum, Jenn. Fl. Tunb. Wells 176. Parfitt 

 in Grevillea i., p. 10. Eng. Fl. v., p. 321. Harv. Man. 150. 

 Kirsch. Alg. Schl.,p. 84. Trans. Bot. Soc. Edin. vi., 424. Eng. 

 Bot. ii., p. 127, t. 2422. Hass. Alg. t. 77, f. 5. 



Hydrogastrum granulatum,, Kabh. Alg. Eur. iii., 265. Desv. 

 Fl. Ang. 19. 



Lichenoides fungiforme, Ray Syn. iii., p. 70. 



Tremella palustris, Dillen. Hist. Muse. 55, t. x., f. 17. 



Botrydium argillaceum, Grev. Alg. Brit., p. 197, t. 19. Kutz. 

 Tab. vi., t. 54. 



Vaucheria granulata, Grev. Fl. Ed. 306. Gray. AIT. i., 290. 



Vaucheria radicata, Hook. Fl. Scot, ii., 93. 



Vaucheria multicapsularis, Harv. Man. 149. Gray Arr. i., 

 252 (?). 



Ulva granulata, Lightf. Fl. Scot. 976. Hull. Brit. Fl. 309. 



Tremella granulata, Huds. Fl. Ang. 566. With. Arr. iv., 

 80. Eng. Bot. i., t. 324. 



On the ground in swampy places. 



"The plant about H mm. diam. ; the upper portion, or that above 

 ground, globular, gradually narrowing downwards, and passing into one 



