BY JOHN SHIRLEY, B.SC. 



99 



marginal, sub-pedicellate, pale, with a tlialline border ; disk 

 always naked, concolorous with thallus or pale flesh-coloured. 

 Spores oblong, 1-septate, usually curved : paraphyses separ- 

 ate. Spermagonia with branched filaments ; sterigraata 

 with few articulations ; spermatia cylindric, or oblong- 

 cylindric, straight. 



* Thallus K + 



1. R. scopulorum, Ach. 



Thallus excessively variable in height and branching, pale 

 straw coloured, rigid, cartilaginous, polished • lacini* 

 elongate, linear, subtereti-compressed, simple or branched at 

 Sn. the apex, attenuate ; cortical layer solid, external portion 

 amorphous, internal portion filamentose ; medulla K yellow 

 then ferruginous red ; apothecia marginal and subterminal ; 

 receptacle nearly smooth. Spores 8, colourless, 1-septate, 

 •01 x -005 m.m., variable, oval or oblong, str light, or 

 slightly curved, subpyriform or soleaeform, Thecse *06 x -01 

 m.m. Paraphyses sub-discrete, united at the brownish- 

 yellow tips. Spermagonia in pale colourless receptacles. 

 Hob — On white mangroves, Humpybong. 



2. R. complanata, Ach. 



Thallus compressed, more or less longitudinally striato- 

 nervose or reticulato-nervose or subcostato-unequal, little 

 branched, furcate or pinnate, gradually reaching a point at 

 the apex, pale green to brown ; cortical layer filamentose ; 

 gonidia larger than spores. Apothecia small, from pale 

 flesh-colour to concolorous with frond, on short pedicels, 

 medial, not terminal ; thalline marg.n little raised ; spores 

 Sn. ovate or ovate-fusiform, 1-septate, pellucid, -006 — -007 x 

 •0035 m.m. Spermagonia in pale colourless conceptacles. 

 Medulla K rufo-ferruginous. Very nearly allied to R. 

 Ecklonii. 



Sab. — On trees in Brisbane orchards and Botanic Gardens. 



3. R. gracilis, Ni/l. 



Thallus attenuate, fruticulose, pallid, stiff, angulate-terete, or 



