84 Sturch. — Harv eyellci mirabilis ( Schmitz & Reink e). 
the genus Choreocolax , but the organs of reproduction of 
these plants were at this time unknown. In 1889 Reinke 
and Schmitz 1 founded a new genus, Harveyella , of which 
this plant was the typical and only species : they placed 
it in a new genus because the structure of its thallus differs 
from that of Choreocolax Polysiphoniae , the typical species 
of the genus Choreocolax . In their paper, after a short 
description of the development of H. mirabilis , it is stated 
that the cystocarp is formed in a similar way to the cystocarp 
of Caulacanthus , and that its structure shows that the Alga 
belongs to the Gelidiaceae. In 1891 Richards 2 discovered 
the cystocarp of Choreocolax Polysiphoniae , which differs 
essentially in structure from that of H. mirabilis , thus 
showing that the division of the original genus Choreocolax 
into two was fully justified. In 1889 the genus Harveyella 
was placed, by Schmitz 3 , in a distinct family, the Harvey- 
elleae, next after the Binderelleae — which includes Binderella 
and Choreocolax— at the beginning of the Gelidiaceae. In 
1890-91 Holmes and Batters 4 included H. mirabilis in their 
list of British Marine Algae, and placed it in the same 
position as Schmitz had done. In 1896 the genus was 
described by Schmitz and Hauptfleisch 5 and maintained 
in the same position among the Gelidiaceae. After a short 
description of its morphological development, the sporangia 
are stated to be unknown. The antheridia are mentioned 
as covering the entire surface of small, flat ‘ Fruchtpolstern.’ 
The carpogonial branches are formed in large numbers, are 
3-celled, and affixed laterally to cells of the peripheral 
filaments. A short description of the mature cystocarp is 
given, but there is no mention of the actual development 
1 J. Reinke, Algenflora der west!. Ostsee Deutsch. Anth. : Berlin, 1889, p. 28. 
2 On the structure and development of Choreocolax Polysiphoniae (Reinsch) ; 
H, M. Richards, 1891, Proc. of the American Acad, of Arts and Sciences. 
3 Systemat. Uebersicht der bisher bekannten Gatt. der Florideen, 1889. 
4 Holmes and Batters, ‘ List of British Marine Algae,’ Annals of Botany, 
1890-91. 
5 Die Naturlichen Pflanzenfamilien, &c., Engler and Prantl ; .Gelidiaceae, 
Schmitz and Hauptfleisch, Lief. 142, p. 344. Leipzig, 1896. 
