102 ANNALS OF SCOTTISH NATURAL HISTORY 



63. C. globosum, Bulnh. Not common. Inverness, Aberdeen, 



Kincardine. 



64. C. gradatum, Roy (" Desmids of the Alford District," in " Scot. 



Nat.," January 1890, p. 203). Not common. Caithness, 

 Ross, Inverness, Aberdeen, Kincardine, Forfar, Perth, Fife, 

 Wigtown. 



65. C. granatum, Breb. General. 



/3 elongatum, Nordst. Rare. Aberdeen near Aboyne, 

 at Homehead in Logie-Coldstone ; and in Balloch- 

 buie near Balmoral; Kincardine at Muchalls ; 

 Forfar at Reeky Linn. 



y Grunovii (Grunow, in Rabenhorst's " Beitrage," Heft 

 II. p. 15, Taf. II. fig. 27). Extremely rare. Aber- 

 deen in Glen Callater, at the Break Neck Fall. 



66. C. Grantii, n. sp. (C. didymopcntachondrum, R. and B.'s MSS.) 



Medium sized ; nearly as broad as long ; sides and ends 

 almost straight, with prominent undulations, which do not 

 extend beyond the edges, minute granules or crenulations 

 taking their place on the front of the frond ; five pairs of 

 more prominent granules at the base of each semi-cell ; con- 

 striction deep and narrow. Length, 34-35 //. ; breadth, 30-31 

 \L ; isthmus, 13-14 p. (Our Plate I. fig. 10.) 



Named in honour of Mr. P. Grant, a pioneer collector of 

 Desmidiea in the north-east of Scotland. 



Very rare. Found only on wet rocks as yet. Aberdeen 

 Glassel and Slewdrum ; Kincardine Letterbeg in Strachan. 



67. C. granulusculum, n. sp. Small sized; orbicular; nearly as 



broad as long ; basal angles rounded ; sides curving rapidly 

 towards the rounded ends ; constriction very deep and 

 narrow ; surface rather closely covered with minute pointed 

 granules ; semi-cells in side view globose, in end view oval. 

 Length, 35 //, ; breadth, 31 //, ; isthmus, 8 p. (Our Plate II. 

 % 8.) 



Very rare. Aberdeen Howford near Inverurie ; Kin- 

 cardine Gillan near Banchory ; Perth Folotry. 



68. C. Gregorii, Roy and Bisset (Gutwinski, "Flora Glondw Okolic 



Lwowa," Krakow, 1891). Small sized; slightly longer 

 than broad ; constriction narrow, linear, deep ; sides rect- 

 angular at first, then with two large rounded undulations ; 

 end truncate, half the breadth of the base, indistinctly 4 to 6 

 undulate; sides with minute granules on each undulation, 

 from which rows of about 3 in each converge towards the 

 centre, which is usually very obscure, but has 3 perpendicular 



