56 BRYOLOGY OF NEW ZEALAND. 
is composed of nearly homogeneous cells, without clearly defined deuter ; 
and of the peristome teeth, which are comparatively broad, flat, and short, 
entire or scarcely divided, and usually smooth without papillae or striolae. 
The alar cells also are differentiated, usually very markedly; the upper 
cells always smooth, generally linear, and usually more or less incrassate. 
It will be seen that the following arrangement involves a considerable 
reduction of species, and a further drastic reduction will probably have to 
be made in the genus, many new species having been created without full 
allowance being made for the wide distribution possible of any given species 
through the subantarctic regions. Correspondence on the subject. with 
M. Cardot has led to certain conclusions which I have incorporated in 
the synonymy of the New Zealand plants; and, in addition to these, M. 
Cardot informs me that the following reductions are also necessary :— 
Blindia leptotrichocarpa C. M. (Fuegia) = Ditrichum Hookeri (C. M.) 
Hampe. 
B. auriculata C. M. (Fuegia) = Dieranum inerme Mitt. 
B. humilis C. M. (Chile, Fuegia) = Dieranum pumilum Mitt. 
B. churuccana Besch. (Magellan) = Dicranum pumilum Mitt. 
B. pulvinata C. M. (Kerguelen Island), probably = Ditrichum conicum 
(Mont.) Par. 
Key To THE SPECIES. 
Plants very slender, usually under an inch in height; seta arcuate when 
. moist .. ee at ee us Ae 3. magellanica. 
Plants taller, rarely less than an inch; seta straight or flexuose ., “s 2 
— 
2 { Capsule immersed ; upper cells minute, oval, 1} or 2 x 1 -- 2. contecta. 
"(Capsule exserted ; upper cells very long and narrow iS -- 1. tenuifolia. 
