BRITISH C@ANOGONIACER 267 
Rhenane (1815). It is characteristic of these two plants, to find 
that they are both present in the specimen cited, though the 
his Morphol. of the Fungi, p. 44 (Eng. transl.). He regards Cysto- 
coleus of Thwaites as synonymous with Racodium rupestre Pers., but 
allied with Chroolepus, and therefore to be classified under Ceno- 
gonium. Only one specimen, collected by Larbalestier at Kylemore, 
Ss Racodium rupestre. ave also ha 
Conway belong to Cenogonium. 
é genus Cenogonium was founded by Ehrenberg in 1820 (Hore 
Physcia Berolinensis, p. 120) on a species C. Linkii, from Central 
America. It is mainly a tropical genus, and almost all the species 
are brightly coloured. Ehrenberg describes the loosely-growin 
hitherto recorded from Europe as a Ceenogonium was found by Hugo 
liick i Ixxxii. p. 268 (1896)). It 
grew abundantly on a siliceous substratum, and attained a con- 
a new discovery, Cwnogonium germanicum. He gi drawin 
a full description of the plant; the fi 
the dark hyphal investment. 
In Ann. Mag. Nat. Hist. 1869, p. 241, G. H. K. Thwaites pub- 
lished a new genus Cystocoleus, to contain a form of Byssus nigra, 
also called Chroolepus ebeneus. His descriptions and drawings leave 
no doubt he was dealing with the species afterwards discovered in 
ermany. Glick knew of his work, but had misunderstood the 
description ; he dismisses it as being symbiotic with Cladophora, and 
therefore not a Cenogonium, and not the German plant. Thwaites 
i 1 
had distinctly noted the likeness to Chroo See 
en ich in structu closely resembles the 
filaments of Chroolepus, protrudes beyond the invest , and 
maar’ b . . 
teddish, oily-looking endochrome of Chroolepus.” No dimensions 
