232 SCYTONEMEJS. 



Hob. Springs on the moors near Wolsingham, Durham : 

 Mr. Backhouse. In a bog on Tower Hill Common, near 

 Southampton : J. Woods., Esq. West Blanket Island, 

 Kerry : Mr. Andrews. Aberdeen : Dr. Dickie. 



" It is composed of dense tufted masses of a dull brown, 

 except when held against the light, in which position they 

 appear of a horny or dirty orange hue. They are of a rigid 

 substance, and do not adhere to paper in drying. The co- 

 pious branches are irregular, wavy or curved, the ultimate 

 ones blunted, and many of them turned one way. The 

 greatest peculiarity of this species is that a chain-like row 

 of vesicles runs along the centre of the frond, each of which is 

 marked with a central dot, probably consisting of a mass of 

 seeds." E. B. 



2. HASSALLIA COMPACTA Hass. 

 Plate LXVIII. Fig. 3. 



Char. " Filaments decumbent, branched, densely interwoven 

 into blackish tufts. Branches suberect, dichotomous, and 

 fasciculate within, furnished with transverse rings." 

 Grev. 



Scyt. compactum Harv., 1. c. p. 364. ; also in Manual, p. 154. 



Hob. Moist rocks in the Pentland Hills : Messrs. Arnott 

 and Greville. 



This species, with a specimen of which I have been kindly 

 favoured by Dr. Greville, does not differ very considerably 

 from H. ocellatum, and chiefly in the closer arrangement of 

 the sporidia. I am not certain that it is really distinct. 



3. HASSALLIA TURFOSA Hass. 



Char. Frond coriaceous, sparingly branched. Branches sub- 

 erect. Cells annuliform, rarely beaded. Sheath broad. 

 Dematium turfaceum Pers. Myc. Eur. vol. i. p. 68. ; Lk. 

 Sp. PL i. 134. ; E. B. 2826. fig. 1. 



