90 TASMANIAN BRYOPHYTA, 



CERATODON PURPUREUS (L.), Brid. 



Stems erect, and generally about 5 m-m., but elongat- 

 ing in shady places, simple or dichotomously divided. 

 Leaves erecto-patent, imbricate, lanceolate, acute, margin 

 revolute, nerve lost in the apex to exciirrent in a short 

 point, 2.5 m.m, Seta very long and slender red-purple. 

 Capsule narrow, slightly bent, erect or inclined, 2.5-3 

 m.m. ; lid oblique ; peristome teeth long, slender, in- 

 curved at the tip, assuming a fanciful resemblance to a 

 ram's horn. 



Variable and very common on ground. 



CERATODON STENOCARPUS, Mont. 



Habit of the last, with similar leaves. Seta very long, 

 slender, pale. Capsule erect or inclined, narrow, 1.5 m.m- ; 

 lid shortly conic ; mouth oblique ; peristome shorter 

 than in C. purpureus, and less regularly curved, articula- 

 tions few and distant. 



Common in open pastures. 



DITRICHUM, Timm. 



Small, erect, simple, forming mats; sometimes in spe- 

 cies not Tasmanian, tall and slender. Leaves narrow, 

 subulate, or linear, from a broad sheathing base ; margin 

 involute, smooth ; nerve broad and flat, constituting all 

 or nearly all the lamina above the sheath ; cells narrow, 

 rectangular, broader and shorter towards the base, but in 

 some species the cells are oblong and incrassate. Seta 

 slender, straight; capsule cylindric or fusiform, usually 

 slightly inclined; lid conic; calyptra narrow, subulate. 

 Peristome teeth split to the base, forming 2 slender papil- 

 lose legs. 



Th3 genus is closely allied to Ceratodon, but the elon- 

 gated cells of most of the species is an advance towards 

 typical genera. . The four species v/ith Icng cells here de- 

 scribed differ from one another only in unstable details, and 

 cculd well be considered forms of one widely distributed 

 plant. 



Cells oblong. 



Capsule cylindiric elongatum. 



Capsule fusiform australe. 



