CHAKA FRAGILIS. 65 



C. fragilis var. elongata CossoN & Germain PI. Env. Par. p. 680 

 (1845). 

 ExsiccATA :— Braun, Rabenh. & Stiz. 14, 112, 121 ; Erbar. Ci-itt. 

 Ital. 551, 101 (1101) ; Jack, Lein. & Stiz. 208 ; Migula, Syd. & Wahlst. 

 44, 99, 150; Nordstedt & Walilst 115a, 6; Rabenhorst 240. 



Larger and more robust than the type. Stem stouter ; 

 internodes much exceeding the branchlets ; branchlets 

 long, usually stout, often with 4 fertile nodes. 



We have seen specimens referable to this variety 

 from Somerset, S., Sussex, E. & W., Surrey, Essex, N., 

 Middlesex, Berks, Norfolk, E., Cambs, Beds, Hunts, 

 Northants, Worcester, Warwicks, Lincoln, S., Derby, 

 Anglesea, Stirling, Aberdeen, N., Galway, W., and Mayo, 

 E. It is probably to be found in many other counties. 



A large, rather rough-looking and often straggling plant, 

 sometimes attaining to a height of several feet, in its extreme 

 forms remarkably different in appearance from the type, the 

 whorls often 5 cm. or more across, the branchlets occasionally 

 even lengthening to as much as 10 cm. A form with extremely 

 slender stem and branchlets was collected by Dr. Kidston in 

 Airthrey Loch, StirUng. 



16. Chara delicatula Agardh. 

 (Plate XLIV.) 



Chara fragilis Auct. plur. pro parte. 

 ■C. viridis Hartman Hdb. Skand. PI. p. 378 (1820) ?. 

 C. delicatula Agardh Syst. Alg., p. 130 (1824) non Desv. 

 Bratjn in Cohn, Krypt. PL Schles. I, p. 411 (1876). 

 Sydow Eiu-op. Oharac. p. 97 (1882). 



Migula Die Characeen, p. 752, f . 148 (1897) ; Krypt.-Fl. Deutsch. 

 II, ii, p. 362, t. 78, f. 4 (1907) ; Syn. Chai-ac. Europ. p. 164, f. 133 

 (1898). 

 HoLTZ Oharac. in Krypt. Mark-Brandeub. IV, i, pp. 119 and 113, f . 2 



(1903). ^ 



Ktjczewski Morpb. u. biol. Unters. an C. delicatula (1906). 

 •C. pilifera Agaedh Syst. Alg. Introd. p. xxviii (1824). 



C. virgata Kf TzmG in Plora, XVII i, p. 705 (1834) : Tab. Pliyc. VII, 

 t. 56, f. 2 (1857). 



■C.foliolata Hartman Hdb. Skand. PI. ed. 3, p. 259 (1838). 

 C. fragilis var. longibracteaia Rabbnhorst Deutsch. Krypt. PL II, ii, 

 p. 200 (1847). 



Bratjn in N. Denks. Scbweiz. Ges. Nat. S, p. 21 (1849). 



Leonhardi in Verb. Naturf. Ver. Briinn II, p. 208 (1864). 

 •C verrucosa Itzigsohn in Bot. Zeit. 1850, p. 338. 



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