306 Mr. W. Mitten on the Mosses and Hepaticce of Sussex. 



Nothing further is known respecting this moss, but it has been 

 supposed that a small blackened state of Jungermannia emarginata, 

 found on some of the High Rocks, might have been mistaken for it 

 by Forster. 



Tribe II. DiCRANACEiE. 



Genus 1. Archidium, Brid. 



1. A. phascoides, ^rid. 



Phascum alternifolium, Eng. Fl., not of Dickson. 

 Not common. In wet places on Henfield Common, on Tilgate 

 Forest, and by roadsides near Hurstpierpoint. 



Genus 2. Angstrcemia, B. et S. 



2. A. subulata (Linn.), Mitten. 

 Phascum subulatum, Linn. Eng. Fl. 



Frequent on banks by roadsides ; found more rarely on the Downs. 



Z. A. alternifolia (Linn.)/ Mitten. 

 Phascum alternifolium, Dicks. 



Far less common than the preceding species, and almost confined 

 to clayey soils : it occurs at Hurstpierpoint in several places, at Hen- 

 field, and on Tilgate Forest. 



On this species Bridel founded his genxxs Pleuridium, "ob thecam 

 lateralem aut talem visam," but he seems to have been not well 

 satisfied about it, for he takes care to follow his assertions on that 

 point with " aut talem visam," or " aut talis videtur." The authors 

 of the * Bryologia Europaea ' in their last review of these species have 

 adopted Bridel' s name Pleuridium, which appears to be neither 

 founded on a true idea of their mode of fruiting nor applicable to the 

 species. 



4. A. nitida (Hedw.), Mitten. 



Phascum axillare, Dicks. Eng. Fl. 

 Frequent in ditches and places where water is dried up in summer. 



Z. A. cerviculata (Hedw.), C. Miiller. 



Dicranum cerviculatum, Hedw. Eng. Fl. 

 Not rare on peat, and sometimes on wet sandy banks ; at Hurstpier- 

 point, Albourne, Henfield, Tilgate Forest, and Tunbridge "Wells. 



6. A. heteromalla (Hedw.)^ C. Miiller. 

 Dicranum heteromallum, Hedw. Eng. Fl. 



Frequent, particularly on sandy soils. 



A. Hedwigii, Mitten, Dicranum subulatum, Hedw., is stated to 

 grow near Littlehampton in the Appendix to Horsfield's * History of 

 Sussex,' but nothing further seems known respecting it. 



