GRIMMIACEAE. 155 
2. Ptychomitrium Barrii (R. Br. ter.) Dixon comb. nov. 
Syn. Grimmia Barru R. Br. ter. in Trans. N.Z. Inst., vol. 35, p. 337 
(1902). 
Hab.—Near Weston, Oamaru, Nov., 1897. Kennedy’s Bush, Lyttelton 
Hills, on stones (in herb. R. Br. ter. as Rhacomitrium protensum). 
Very distinct from all the species A know in the small size a strongly 
hamate leaves in their upper portion. 
Grimmia Ehrh, in Hedw. Fund., ii, p. 89 (1782). 
R. pig has described twenty-six new species in Trans. N.Z. Inst., 
vol. 27, and five more in vol. 35; very few of these, however, can stand. 
The bulk “of them belong to the subgenus Schistidiwm, and are forms of 
the highly polymorphous @. apocarpa, the variability of which cosmopolitan 
species Brown does not appear to have recognized. 
The new species in vol. 27 are grouped by him under two heads— 
““Columella adhering to the operculum ” and “ Columella not adhering to 
the operculum.” Under the latter are placed several species which, either 
cases an error of ST ia 
Only about half of the new species are to be found in Brown 
acon. but the lalate and figures of the rest make 5H ‘ley 
easy to refer them to one or other of the already described spec 
I hav e arranged the species under the classification given by ‘ees 
in the “ Musci”; the following key will make the arrangement clear :— 
ee Lesyeeti tum. Autoicous. Ca apsule 
e 
eae sually m sate less wide-mouthed and 
heatledheelonl when ines: Columella falling 
away with the 
Te —, dense: sely coespitose ; upper leave 
least, with long ee ep 
hair 1. apocarpa. 
Aquatic ; elongat ate ; leaves with a broad, 
usually obtuse, hairless ite 1. var. rivularis. 
aa GASTERO-GRIMMIA. Au Cape ule 
ced asymmetrically on i the Sealy ork: ; 
sci ‘seta. Columella unattached to lid 2. argentea. 
Subgen. Grimmia sensu as on 
a longish, straight erect, smooth. Lid 
Leaves wide at points, e-Margi 3. campestris 
Subgen. R psule exserted a 
curved seta, ribbed when 
Leaves long and narro cgeande gradually i ap to a 
narrow point; basal cells elongate, é 
i 4. trichophylla, 
eegarateaind preading when 
Leaves as peristome-tee teeth 
strongly Pena , : 
Leaves shorter, wide at points, ‘basal cells all short, 
ery, 
a 5. pulvinata var. obtusa. 
5. pulvinata var. basaltica. 
