HYPNACE.E.] 7 [Thuidium. 



Dioicous; in yellow-green tufts, ochraceous below; stem rigid, 

 pinnate, simple or bipartite, sparingly radiculose, branches crowded, 

 divergent, nearly equal. Cauline leaves crowded, cordate-ovate, 

 acuminate and acute, deeply 4-sulcate, channelled at the slender yellow 

 nerve which ends below the apex, margin of one wing plane, of the other 

 reflexed, crenulate above, central basal cells rectangular. Branch-leaves 

 imbricated, ovate acuminate, very concave, the margin irregularly denti- 

 culate, cells incrassate, roundish, strongly papillose on both sides, those 

 on the back being longest. Paraphyllia densely crowded, forming a pale 

 tomentum, longly lanceolate and filiform. Perichaetium elongated, the 

 inner bracts lanceolate, with slender acuminate points, sulcate, entire. 

 Capsule suberect, cylindraceous, slightly incurved, badious, arcuate 

 when dry ; lid acuminate conic ; annulus 3-seriate. Peristome orange, 

 processes of endostome gaping in the keel, cilia 12. Male infl. 

 numerous, gemmaceous, whitish. 



HAS. Bare grassy banks and sandy heaths, not common and sterile. Fr. 56. 



Sands of Barrie, Dundee (Arnott) ! Hayle Sands, Cornwall (Curnow 1861) ! ! Sands at 

 Pembray. St. Andrews Links (Howie). 



With us this species occurs most frequently near the sea, and is not so 

 regularly pinnate as the next, though very close to it. 



5. THUIDIUM HYSTRICOSUM Mitt. 



Dioicous ; very near T. abietinum, dull green, leaves unequal, 

 longer, variously curved, uppermost subsquarrose, the cells larger, ovoid. 

 (T. LXXXVI, A.) 



SYN. Hypnutn abietinum p.p. DILL. L. et auct. 



Thuidium hystricosum MITT, in SEEM. Journ. Bot. i, 356 (1863). 

 Hypnum calcicola WILSON MSS. 



Dioicous ; dark green, resembling T. abietinum t but more elegantly 

 pinnate. Stem-leaves from a scarcely decurrent broad ovate base, 

 lanceolate, acuminate, subsecund and slightly falcate, the uppermost 

 larger and squarrosely spreading ; the cells longer, elliptical. Branch- 

 leaves longer, loosely appressed and variously curved, ovato-lanceolate, 

 gradually acuminate, the point of 3 long cells ; nerve ending below point, 

 cells larger, ovoid. Fruit unknown. 



HAB. Calcareous hills. 



Hinksey, Oxford (Bobart). Reigate hill (Dr. Holmes). Box hill and Morant's Court hill 

 (Mitten) \ 1 Near Basingstoke (Brocas 1852). Brighton (Da-vies 1868). Shere (Dr. C apron 

 1869) ! ! Barton Mills, Suffolk (Borrcr). Quarry at Ingbarrow farm, Wetherby, 

 Yorks. (Wesley 1877)!! 



