110 INTRODUCTION TO ORYPTOGAMIC BOTANY. 



those of Harvey ; and his names might be adopted, should 

 those of Harvey displease. I do not, however, approve of 

 Vaucheria bemg arranged with Phycoidew, or separated from 

 Caulerpa, nor of several of the other details. It remains only 

 to notice the system of Montagne in his article Phycoid^es, 

 in Orbigny's dictionary. He divides Algas into three famihes : 

 1. Zoospermees, 2. Florid^es, 3. Phycoid^es; which, with excep- 

 tions as to details, are equivalent to Harvey's three divisions. 

 The VauchericB and Spongodim are, however, as truly zoo- 

 spermic as any of the first division, and cannot, I think, be 

 separated from it ; and certainly Gaulerpa ought not to be in 

 a different main division from Vaucheria. 



1. CHLOROSPERME^.— ITam (1841. ]852.) 



Chaodini^ and CoNPEEViE, Bory. 1823. — HtaliNjE and Vibides, Ag. 

 1824. — Ulvace^ and Diatomac^jb, Fr.Fl. Saan.1835. — Zoospeeme^, 

 J. Ag. 1842, Mont. 1847. — ZoospoEBia; and Synspoee^s;, Dgoaisree, 1842. 

 — ZoospoEE>3E, Thuref, 1851. — Confeevace^, Endl. 1843. — Isocarpe^ 

 (Gynmospermeffi), in part, Kiitt,. 1847. — Gonidiophtcks;, Zanardini, 

 1847. — DiATOMACE^ and CoNEEEVACEa;, Lindl. 1853.* 



For the most part herbaceous-green, but varying occasionally 

 to olive, purple, and other tints. Extremely various in form 

 and appearance, often filiform, propagated by the simple divi- 

 sion of the endochrome, by the transformation of particular 

 joints, or by the metamorphosis of the endochrome into zoo- 

 spores. Sexes rarely distinct. 



91. When a piece of stone is exposed to the air, and shaded 

 from the sun, or a stream of water flows down a rock, or a bed 

 of snow is long subjected to radiation, greenish or olivaceous 

 and sometimes reddish matter is formed, consisting of variously 

 organised bodies, which belong to this primary group of Algse. 

 Together with Lichens, they are the first heralds of vegetation ; 



* None of these are the precise synonyms of Chlorospermece, because 

 all the authors understand the aflSnities of certain groups and species 

 differently. 



