54 
ULVACEiE. 
especially when in fructification, the colour being wholly derived from the fructifying 
cells. The colour also generally becomes more intense and more purple after steeping 
in fresh water, and in the process of drying ; and the dried plant has a very glossy 
surface, like satin. Sometimes it adheres to paper and sometimes not ; and it always 
shrinks considerably in drying. 
II. BANGIA. Lyngb. 
Frond thread-shaped, tubular, composed of numerous radiating cellules, disposed in 
transverse rows, and enclosed within a hyaline continuous sheath. Spores purple, one 
formed in each cell of the frond. 
This genus was founded by Lyngbye on the Conf. fusco-purpurea of Dillwyn, and 
several other Alg£e, both marine and of fresh water, which are more or less nearly allied 
to it. Some of these have been properly removed. The genus still contains some 
anomalous species, but the three following appear to me to be con-generic. The genus 
was first placed by G-reville in Ulvacese. This position has been questioned, and I was 
formerly disposed to concur with those who refer it to the neighbourhood of Lyngbya in 
Oscillatoriem ; but a careful examination, especially of B. vermicularis, has now con- 
vinced me that Bangia cannot be far removed from Porphyra , to which it bears the 
same relation that Enteromorpha bears to Viva. 
1 . Bangia fuscopurpurea , Lyngb. ; filaments elongated, simple, decumbent, nearly 
straight, capillary, here and there constricted, forming a brownish-purple, glossy stratum ; 
granules several in each transverse band, dark purple. Lyngb. Hyd. Dan. p. 83, t. 24. 
Grev. Alg. Brit ., p. 177. Wyatt, Alg. Danm., No. 167. Harv. Phyc. Brit., t. 96. 
Kiitz. Sp. Alg. p. 360. B. atropurpurea, Ag. Syst. p. 76. Alg. Eur. t. 25. Conferva 
fuscopurpurea , Dillw. t. 92. E. Bot. t. 2055, and C. atropurpurea , Dillw. t. 103. 
E. Bot. t. 2085. 
Hab. On rocks and wood-work between tide marks. Newfoundland, Herb. Mon- 
tague. Narragansett Pier, Prof. Bailey. Little Compton, Mr. Olney. Providence, M. 
Charles Giraud. Lynn, Mass. Mrs. Estes, (v. v.). 
This is attached to rocks and stones, or to woodwork, and occurs in stratified patches 
of indefinite extent, of a dark purple colour. The filaments are 2-3 inches long, and 
float freely in the water, lying down in a fleece when left by the retreating tide. They 
vary greatly in diameter according to age, and the miscroscopic characters are equally 
varied in young and old specimens. In the young state the filament is formed of a 
