120 ANNALS OF SCOTTISH NATURAL HISTORY 



BARBULA EXIGUELLA. Synoicous. In lax tufts, pale 

 green above, fuscous below, slightly radiculose, short, about -^ 

 inch in height. Leaves distant below, very small, sub-erect, 

 upper much longer, and crowded in a patulous coma, from a 

 longish sheathing, white, thin base, lanceolate, pale green or 

 glaucous, when dry arcuato-incurved ; wings concave, incurved, 

 sloping upwards rather suddenly towards the nerve ; nerve 

 stout, bent upwards near the apex, so that the leaf there is 

 somewhat boat -shaped or cucullate, excurrent in a longish 

 mucro, prominent beneath, smooth, pale ; cells at base 

 hyaline, lax, rectangular, ceasing transversely, gradually 

 becoming smaller and ending in the roundish -quadrate, 

 small chlorophyllose cells, papillose on both sides, and 

 margin crenulate from projecting cells. Perichaetial leaves 

 of laxer texture, the inner composed of a larger proportion 

 of hyaline cells. Setae pale or yellowish, straight, very 

 numerous ; capsule not formed. 



I have only on two occasions seen antheridia nearly in 

 apposition to a germinating archegonium. 



On the ground in open fields, Mainland, Orkney, August 

 1887 ; plentiful. 



BARBULA AGGREGATA. Stems rather densely, at times 

 laxly, aggregated, from one to one and a half inch in height, 

 stout, sparsely and shortly branched above ; leaves thickly 

 set on the stem, when dry circinnately incurved, nearly 

 straight when moistened, lanceolate, scarcely acuminate, 

 fragile ; pagina incurved upwards, sloping towards nerve 

 pretty suddenly at the acute apex ; nerve smooth on back 

 and pale, somewhat glistening, extruded in a short acute 

 mucro ; areolation at base as in that of B, tortnosa, sloping 

 upwards to margin at a very acute angle, and prolonged in 

 all the lower leaves as a single row of small smooth cells to 

 apex, so that the margin is smooth ; apical leaves, crenulate 

 in upper half ; rest of the areolation dense, opaque, and 

 minutely papillose. On sandy soil near the sea, Harris, 1886. 



BARBULA CIRRHIFOLIA (>SV//.) is recorded here because 

 it was discovered by me on Ben Lomond in 1863, the only 

 Scottish station at that time. A specimen was sent to 

 Professor Schimper. This is Mollia hibernica (Mitt.}, Braith. 



