316 BRYACE^E. 



appendages, the basal membrane often more or less adherent to 

 the outer teeth. Outer teeth with numerous irregular oblique 

 lines apparently connecting the transverse articulations. 



C. CLADODIUM. Innovations not julaceous ; cells as in 

 Ptychostomum. Inner peristome as in the last ; outer without 

 oblique lines on the face of the teeth, simply barred transversely. 



D. LEUCODONTIUM. Innovations not julaceous; cells as 

 in Ptychostomum. Inner peristome perfect, (in B. pallens rarely 

 imperfect), the cilia being usually well-developed, as long as the 

 processes, with distinct transverse appendages ; basal membrane 

 not adherent to the outer peristome. Outer teeth pale yellow 

 throughout their length, hardly thickened at base. 



E. EU-BRYUM. Innovations not julaceous (except in B. 

 argenteum) , cells as in Ptychostomum. Inner peristome perfect. 

 Outer teeth pale yellow above, at base thickened, deeper in 

 colour, orange. 



F. RHODOBRYUM. Leaves in wide terminal rosettes, 

 very large, the lower scale-like. Cells large, hexagonal. Stems 

 tall, robust, with creeping subterranean stolons. Peristome as in 

 Eu-bryum. 



In order to assist in identifying the species of this difficult genus the following 

 Key has been partly based on more artificial, but more easily observed characters, 

 and should be used in conjunction with the above synopsis. The Keys to the species 

 described under each Section will be found under their respective headings, on the 

 page referred to in the general Key. The letters preceding the reference to the pages 

 indicate the Sections. 



/Leaves not bordered, at least in the upper part 2 



\ Leaves distinctly bordered with narrow cells 8 



/Nerve ceasing in or below apex, or leaves sub-acute 3 



\ Nerve excurrent in a distinct point, Is. acuminate 7 



/Upper leaves large, in a rosette, serrate ; plant stoloniferous .32. roseum 



•'XLeaves smaller, entire or nearly so 4 



f Branches julaceous with the short, concave, imbricated leaves; cells almost 



4] linear A (p. 317) 



(^Branches not julaceous (except argenteum, with very wide cells) 5 



f Ls. much shrivelled when dry, distant, either very decurrent, or orbicular and 



5-^ obtuse D (p. 323) 



^Ls. less altered when dry, not markedly decurrent nor distant 6 



I Plant small; Is. wide, obtuse or with wide short point C (p. 319) 



6-j Plant often tall ; Is. rather long and narrow, or with an abrupt, narrow apiculus... 

 I E (p. 326) 



/Cilia without appendages ; usually autoicous 3. Warneum 



' \ Cilia appendiculate ; synoicous, dioicous, or barren 11 



„/Cilia without appendages, or none ; (Is. acute or acuminate)* C (p. 319) 



\Cilia appendiculate 9 



/Leaves with thickened, bi-stratose, sharply-defined border 10 



y \ Border unistratose, usually less sharply defined from the cells within II 



* This includes B. pendulum, see the Key to Cladodium, No. 7. 



