TOLYPELLA PBOLIFERA. 135 



Ireland: Canal near Grlasnevin. (D. Moore). 



First record (as 0. nidifica) : ' English Botany,' 

 Suppl. 1834. 



Outside the British Isles T. prolifera is recorded 

 from France, Belgium, Holland, Germany, Switzer- 

 land, Austria, and Italy ; also from North and South 

 America. 



By far the most robust species of the genus. A medium- 

 sized or large plant, 20-35 cm. high with a very stout stem, 

 the lowest portion of which is often much elongated. This, 

 added to the large number of branches originating from the 

 lowest whorl, gives the plant a peculiarly tree-like aspect. It 

 is usually much incrusted and the spiral-cells often secrete a 

 lime shell. 



It is readily distinguished from T. intricata, of which it 

 was formerly thought to be a variety, by the stout simple 

 sterile branchlets. It also differs from that species in the 

 taller coronula with elongated upper cells, and the smaller 

 antheridium. 



Section 2. ALLANTOIDEJ3 (= Obt iisifolia ALLEN). 



Ultimate cell of rays not much abbreviated, allan- 

 toid, rounded or very slightly pointed at the apex. 

 Spiral-cells of oogonium usually swelling at the apex 

 at maturity. Coronula usually deciduous. 



3. Tolypella glomerata Leonhardi. 

 (PLATE XIX.) 



Cham nidifica SMITH Engl. Bot. t. 1703 (1807). 

 HOOKER Brit. Fl. II, p. 245 (1833). 



C. glomerata DESVAUX in Loiseleur 'Notice aj. Fl. France' p. 135 



(1810). 

 BRATJN in Flora XVIII, i, p. 55 (1835). 



Nitella glomerata CHEVALLIER Fl. Gen. Eiiv. Paris, ed. 2, II, p. 124 



(1836). 



COSSON & GERMAIN Atl. Fl. Par. t. 41, f. H (1845). 

 KUTZING Sp. Alg. p. 517 (1849). 



WALLMAN Forsok syst. Charac. p. 42 (1853) ; Transl. p. 35 (1856). 

 BRAUN in Monatsb. Akad. Berl. for 1867, p. 894 (1868). 

 CREPIN in Bull. Soc. Bot, Belg. II, p. 130 (1863). 



