70 DICRANACE/E. 



1. Rhabdoweisia fugax B. & S. (Oncophorus striatus 



Lindb., Braithw. Br. M. Fl.) (Tab. XIV. A.). 



Bright or dark green, in short, soft, dense tufts or cushions ; 

 leaves narrowly linear or ligulate, curled when dry, shortly 

 acuminate, more or less acute; margin plane, faintly denticulate 

 or almost entire at apex ; nerve ceasing below the summit ; 

 areolation rectangular at base and pellucid, gradually becoming 

 quadrate, in the upper part in 5-7 regular rows on each side the 

 nerve of rounded-quadrate or transversely elliptical cells, some- 

 what incrassate, 6-8 /* wide, faintly papillose, chlorophyllose. 

 Capsule on a very short seta (1-2 lines), very small, pale, erect, 

 symmetrical, oval, wide-mouthed and urceolate when dry and 

 empty, distinctly striate ; lid with a curved, subulate beak, as long 

 as the capsule. Peristome teeth suddenly subulate from a broad 

 base, reddish, very small and fugacious . 



Hab. Clefts of rocks in alpine and subalpine districts. Not common. Fr. 

 summer. 



A pretty little moss, usually covered with capsules. The peristome is so fragile 

 that it generally falls off almost as soon as the lid separates. The leaves vary some- 

 what in outline and in the amount of denticulation of the point. 



2. Rhabdoweisia denticulata B. & S. (Oncophorus crispatus 



Lindb., Braithw. Br. M. Fl.) (Tab. XIV. B.). 



Resembling the last, but with shorter, wider, more obtuse 

 leaves, the margin in the upper part more strongly toothed, with 

 closer, more acute, and more spreading denticulations ; the upper 

 cells larger, 8-/0 p wide, on each side of the nerve in 7-9 rows of 

 quadrate or quadrate-hexagonal cells with thinner walls. Capsule 

 the same or a little larger and somewhat more elongated, often of 

 a rather darker colour and more solid texture. Peristome teeth 

 subulate from a lanceolate base, articulated, longer, more per- 

 sistent. 



Hab. As the last, but more frequent. Fr. summer. 



A slightly more robust plant than R. fugax ; the characters above mentioned 

 serving to identify it without much difficulty. The differences in the capsules often 

 described are by no means constant. 



3. Rhabdoweisia crenulata Jameson (Didymodon crenulatus 

 Mitt.) (Tab. XIV. C). 



Taller than R. denticulata and more robust, Y2.-1 inch high. 

 Leaves ligulate, broader, obtuse, recurved at apex, margin in the 



