NEW OR CRITICAL BRITISH ALGAS. 
23 
Xiithothamnion corallioides, Crn.,f. subsimplex, Batt. Journ. Bot;, 
1892. 
Cumbrse. 
A variety characterized by the entire absence of lateral branches, 
the fronds being quite unbranched, slender, angularly bent or 
straight. 
Iiithothamnion colliculosum, Foslie Contrib. II., p. 8. 
Cumbree, in from 8-10 fathom water. 
This species covers small stones with a thin pink crust, 0*5- 1’5 
m.m. in thickness, covered with short, simple tubercles from 3-4 
m.m. in height, either tapering to a point or cylindrical, apices 
obtuse. 
BIBLIOGRAPHY. 
Beitrage zur Kenntniss der Ectocarpus-arten der Kieler Fohrde 
(Contributions to a knowledge of the species of Ectocarpus 
of Kiel Haven). By Paul Kuckuck (“ Botanisches Central- 
blatt,” Band 48, No. 1 et seq.) 
With the exception of Kjellman’s monograph on the Scandi- 
navian species, which was published in 1872, the difficult genus 
Ectocarpus has received so little attention of late years that M. 
Kuckuck’s paper dealing with all the species and forms of the 
genus to be met with in Keil Haven is doubly welcome. 
Like Kjellman the author rejects the Kuetzingean genus 
Corticularia , which was based on a very variable character, viz., 
cortication, but differs from him in also rejecting Bory’s genus 
Pylaiella , the typical species, P. litoralis , of which differs but 
little, according to M. Kuckuck, from Ectocarpus siticulosus. 
Pylaiella was supposed to differ from Ectocarpus by both the 
unilocular and plurilocular sporangia being intercalary, but, accord- 
ing to the author, the plurilocular sporangia of E. siticulosus not 
only often terminate in a hyaline hair but also frequently in a row 
of cells provided with chromatophores, while on the other hand 
the variety divaricata of Pylaiella litoralis has terminal pluri- 
locular, and the variety varia terminal and stalked unilocular 
sporangia similar to the corresponding sporangia of other 
Ectocarpi , and lastly intercalary unilocular sporangia are, according 
to Reinke (Atlas, t. 20, fig. 6), found on Ect. ovatus ; similar cases 
have also been observed by the author on E. penicillatus. 
The opinion that Streblonema is also only a form of Ectocarpus 
receives support from some cases studied by M. Kuckuck, in which 
he found plurilocular sporangia similar to those figures by Prings- 
heim for S. fasciculata on Ectocarpus dasycarpus , n. sp., which 
has a well developed, not a creeping thallus. 
The author thinks Reinke wrong in uniting to Ect. confervoides 
all those Baltic Ectocarpi possessing ribbon-shaped branching 
