ch 
Conferva urceolata Dillwyn Brit. Conf. p. 82, plate G (The name is originally due to Lightfoot). 
Hutchinsia urceolata Lyngbye Hydr. 1819 p. 110 pl. 34. 
Hulchinsia stricla Ag., Lyngbye Hydr. p, 115 pl. 36 (e specim.) 
Hutchinsia lepadicola Lyngbye Hydr. p. 113 pl. 35,c; Flora Dan. tab. 2313, 1840. 
Hulchinsia roseola C. Agardh Sp. Alg. p. 92. 
Polysiphonia formosa Suhr, Flora 1831; Harvey Phye. Brit. II, pl. 168, 1849; Kützing Tab. phye. Bd. 13 
tab. 78, 1. 
Polysiphonia pulvinata Flora Dan. tab. 2458. 1845 (?). 
Polysiphonia roseola (Ag.) Areschoug Phye. 1850 p. 59. 
Polysiphonia lepadicola (Lyngb.) Kützing Sp. Alg. 1849 p. 807; Liebman, Kröy. Tidsskr. II Hefte 5 1839, 
p. 478; J. Agardh 1863 p. 945. 
Hutchinsia abyssina Lyngbye Rariora Codana (ed. Warming) 1880, Vidsk. Medd. fra Naturh. Foren. 
1879—80 p. 227. 
The primary shoot of the seedling is erect but a lateral shoot is early produced 
at its base (fig. 341, comp. Tobler fig. 19) or sometimes two. Creeping branches 
appear later and form a system of procumbent shoots attached to the substratum 
by scattered rhizoids and giving rise to a great number of erect shoots forming a 
dense tuft. The procumbent branches are often very short-celled, the articles being 
much broader than long (fig. 342) while in other cases the articles are of equal 
length or a little longer than broad (fig. 343). The growing end of the decumbent 
branches usually grows upwards at last and becomes an erect shoot, but the pro- 
cumbent filaments may remain creeping for a long time, in particular in the f. lepadicola, 
Fig. 341. Fig. 342. 
Polysiphonia urceolata. Sporelings, 9 days old. In A the tricho- Polysiphonia urceolata. Lower part of an ereel 
blasts are arranged in a spiral turning to the right. 227 :1. branch issuing from a procumbent branch. 95:1. 
52* 
