REVISION OF THE BRITISH COLLEMACEI. 831 
Scytonema, nia ne for the reason just mentioned, are temporarily 
‘omitted. Sp. 1. G. velutinum Si Be koe not very uncommon in 
fruit 
other ald Scytonemas. 
onema, ‘Bin. To this nin i 4 are to be ig erie the 
states is core ies into two distinct species of Spilonema. 
p. 1. S. paradox Born., rare and local, at least in fruit, in W. 
maritimo-montane Bitainy/ i N. Wales an N. Argyleshire. Sp. 2. 
8. revertens, Nyl. n micaceo-schistose mountain rocks, usually 
referable Sirosiphon saxicola, Na&ég, prop. Sp. S. scoticum, Nyl. 
‘On ticaceo-schistose .rocks, probably Abadi though very 
tarely met with in fruit on Ben Lawers. To this also is referable 
Sirosiphon saxicola, Naée., pro’ max. p. Though these two latter 
‘Species, viewed as Algse, would in an infertile state appear identical, 
yet viewed as Lichens, their fructification shows that no two species 
can be more distinct. 
WhIdh oo 
Tribe II. Collemei. 
This tribe also includes some species of “ Pseudo-alge,” , the 
Mostoce, which there can be little doubt are ete sadreopel states 
af Collem sore ie on igeey in ceo Se. Rev. l.c 
* The opinion there expressed has been further confirmed by recent ctr 
Appin, ‘wk re in several instances, and un under cireumstances wi om 
 Weatel any seems ae of the phenomena witnessed ee thi er 
Denn Nor commune put g into young Collem , and on the other 
Wand the Collema in old decaying state degenerating into the No 
Lf ‘may, therefore, legitimately @ with Nylander, that the 
ery much the same to the C Senta 80 Lara 
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