GONATOZYr.ON. 31 



SCOTLAND. Generally distributed! (Tfni/ 

 Skve in Inverness ! Lewis and Harris, Outer Hebrides ! 



IRELAND. West-port, Mayo ! Balieli Loughs and ne:ir 

 Recess, Galway ! Muckross and Glengariff, Kerry! 

 Dublin and Wicklow (Arrlir.r). Ram's Is., Lough 

 Xeagh ! Loughs Anna, Darragh, and Gartan, Donegal ! 

 Lonsrh Fea, Londonderry ! Slieve Donard, Down ! 

 Tipperary, with zygospores (Archer). 



(Iroiji'. Distribution. France. Germany. Austria. 

 Hungary. Sweden. Faeroes. X. Russia. Greenland. 

 India. Ceylon. Siam. Sumatra. West, Central, and 

 East Africa. W.Indies. United States. Brazil (var.). 



Var. pilosellum Nordst. 



Gonatozygon monotrenium var. pilosellum Nordst. in Wittr. & Nordst. Alj. 

 Exsic. 1886, no. 750 ; fasc. 21, p. 48. 



Cell-wall furnished with fine papillate or spinate 

 projections up to 2' 5 p in length. 



WALES. Between Llyniarth and Graig, near Dol- 

 gelly, Merioneth (Nordstedt). 



IRELAND. Dublin Mts. (Archer). 



Geogr. Distribution. Brazil. 



This variety differs from (r. pilosum Wolle in the slig-htly 

 dilated apices of the cells and in the less acute hairs (or 

 spines), which are also somewhat denser. 



2. Gonatozygon Brebissonii De Bary. 

 (Plate I, figs. 8-11.) 



Docidium ? asperum Ealfs, Brit. Desm. 1848, t. xxi, f. 6 c ; Breb. Liste 



Desm. 1856, p. 147, t. i, f. 33. 

 Gonatozygon Brebissonii De Bary, Conj. 1858, p. 77, t. iv, f. 26, 27 ; Archer, 



in Pritch. Infus. 1861, p. 722 ; Eabenh. Flor. Enrop. Algar. Ill, 1868, 



p. 156 ; Cooke, Brit. Desm. 1886, p. 2, t, i, f . 2 ; West, Altf. W. Ireland, 



1892, p. 114 ; Eoy & Biss. Scot. Desm. 1894, p. 250. 



Leptocystinema Portii Archer, Suppl. Cat. Desm. 1859, p. 251, t. xxi, f. 6. 

 Gonatozygon asperum Lutkem. Desm. Attersees, 1893, p. 539 ; Johnson, 



Eare Desm. N.S. II, 1895, p. 291, t, 239, f. 8. 



Cells 10-16 (sometimes 30-40) times longer than 

 their diameter, narrowly cylindrically-subf nsif orm, poles 

 subcapitate ; cell-wall minutely and densely granulate ; 

 granules variable, sometimes scarcely visible, sometimes 



