^^ REVUE BRYOLOGIQUE 



Grimmia homodietyon Dixon. — sp. nov. 



Resembling G. calyptrata Hook. Tuft low, grey, hoary 

 with the hair-points of the upper leaves; stems reacKly 

 faling apart, half an inch in height, two or three ttmes 



stemtm^lVr'S '''^^OKp^f^'^r rigid. Central strand of 

 stem smaller and more indistinct than in G. cahmtrata 

 ground tissue of somewhat smaller, more incrassa^e Cells' 



.S/T^W' ---^-Pf-t -hen moist'^tr'j^^ 

 stimglit ivhen dry, ovate-lanceolate, from a rather wide 



iT 2'm.'t"l"^ IT^'^^'V' ^ '-^^^^^ broad pZT; 

 1,15-2 mm m length (to base of hair-point) by 5- 



wUh™a '^S' IT""''' P^^r; ^-nn^^te-conc'ave, /he lower 

 witn a shoit, the upper with a lonqer (about 1 mm ^ 



f^onglysjnmaose broad hair, resembling hat of G T/- 

 cophxa Grey. One or both margins (usually one sh-htlv 

 the o her strongly) recurved ', one or two marg^aW^^^^^ 

 of cells in upper part thickened, in two layers Nerve rathi? 

 brow? ^^'^'^'y^f^^t^ below, in matu^re leaves o ran ge- 



cCnelfpd n;' '''''''' above slightly wider, distinct, slightly 

 cnanneiled on upper surface. «trnnrTit/^^^,,„„ ' j^_ J^ 



leaf 



upper surface strongly convex and very 



=/ 



s-i- "" - Sets .ir;Kf 'sT'ii 



below and of a more Sni o m ^mI f^'^'l ''^^^ «"'■»'«<'« 



points oflhe upperfeaves a™ S &ra "''.''^'^; 

 give a very slrikina annPT-nn^L .„ .u ^f^ (^"'' """•). and 

 much less spinu ofeThan ,n ,h» % ? P'^nt; but they are 

 also, especially the tosal nni l^™'""? ?'=">'' The cells 

 differenc'e, the'hy^ in^lr e^ ,s' in T rf'''? ^°''l'' <" 

 very numerous, i^ several ^oT.tlf,^t'St^T„l 



