266 THE JOURNAL OF BOTANY 
Woodhouse Eaves; Sileby; Farm Town; near Altons, Ashby 
Sinope; Sepia cage near the canal; Horninghold; East Norton 
—Var. britannicus (Rogers). Sutton Ambien, Bell.—Var. diversi- 
folius (Lindl.). Glen Gorse ; Cropston ; Thurcaston ; Swithland.— 
ar. tuberculatus Bab. Boothorpe Lane ; between Sutton Cheney 
and Ambien Wood.—Var. fasciculatus (PJ J.M.). Near Quorn; field 
by Quorn Wood. - 
R. coryiirotius Sm. Common in hedges, associated with other 
cesians. — Var. cyclophyllus (Lindb.). ere Road, Knighton ; 
Blaby; Birstal Gorse; Thurcaston; East Nort — Var. concinnus 
Noemie ee me i va seen on the red sacl at East Norton. 
Mr. Rogers so names a bramble collected 
at Seemcs Ambien Wood | in July, 1904, but says that better speci- 
mens are desira 
R. castus ‘i ie and damp woods, often hybridizing with 
other Cesians. 
BRITISH CC@NOGONIACEA 
By A. Lorrain Smira, F.L.S. 
Srupents of cryptogamic botany, more especially field workers, 
are probably familiar with a dark-coloured, finely filamentous 
creeping plant, found in moist shady localities spreading over rocks 
and stones, sometimes in small patches, sometimes covering a fairly 
large area with its felt-like growth. No fructification has ever been 
found in connection with this plant, and so it has been shifted about 
from one group to another of the vegetable kingdom, and variously 
classified by systematists as alga, fungus, or lichen, and recorded as 
Byssus nigra, Cystocoleus ebeneus, or Racodium rupestre. A more exact 
knowledge of the composition of plants has led to the recognition of 
two distinct forms under these names, very similar in appearance 
and habitat, both sterile, and both lichens—in the one case Raco- 
dium, containing the algal constituent Cladophora; in the other 
‘enogonium, in which on alga is Chroolepus (=T' rentepo ohlia). 
the family Cenogoniacee. wo plants are Cae dininguiche 
nder the microscope; in Racodium the investing fungus lies 
straight unbranching lines along the Cladophora filament, while j i 
9 e ngal hyphe branch repeatedly, and wind 
round the irregular bulging cells of the alga , Chroolepus aureus. 
Page “ Notes sur le genre Trentepohli ia’ * (Journ, de Bot. iv. p. 91, 
1890), P = Cystocoleus ebeneus) 
from the genus Trentepohlia. He recognizes the composite nature 
of the plant, “un Trentepohlia (7, euirne A recouvert par des h ~— 
noirs de nature fungique.’’ He also records, as — wi 
Persoon’s Racodium rupestre, basing his statement on as. 
tion of the specimen no. 400 in Mongeot & Nestler’s Stirsiee: Vogeso- 
