ADDITIONS AND CORRECTIONS TO VOL. I. 



p. 96, line 24. After " genus " add Tolypella nidifica and a few 



CharcB. 

 p. 102. Add [Nitella opaca] : — 



Var. c. brachyclema. 



Ob. & B.-W. Journ. Bot. LXII, p. 33 (1924) ; Exsico. No. 22 (1924). 



Stem very stout (diameter -* 800 ;u), internodes much elongated, 

 branchlets short stout incurved, dactyls often longer than the 

 primary rays. 



In fairly deep water in lakes. 



We have seen specimens from the following locahties, and it 

 is probably to be found in similar habitats elsewhere. 



England : Westmoreland, Grasmere (T. A. Cotton, comm. 

 A. Bennett). 



Scotland: Caithness, Yarehouse Loch, near Wick {J. Grant, 

 comm. W. H. Beeby) ; Shetland, Asta Loch (G. C. Bruce). 



Ireland: Donegal, W., Kindrum Lough ; Lough Naglea 

 {G. R. B.-W.). 



A very large distinct-looking plant resembling N. translucens, 

 attaining to a metre in height, the internodes often as much as 

 12 cm. long and the branchlets usually quite short, the upper often 

 very thick and tumid, not much longer than the diameter of the 

 stem, strongly incurved, and giving the appearance of small knots 

 along the branches. It fruits rather sparingly. This variety 

 presents a marked contrast to the ordinary forms of N. opaca, 

 which is characteristically rather a small compact-growing plant. 



p. 109. Nitella spanioclema, add to Distribution : — 

 Scotland: Perth, W., Loch Lubnaig (N. Annandale & N. G. J. 

 Smith, 1921). 



p. 118. Last line should read [oogonia] " c. 425 fi long." 



p. 140. Tolypella nidifica, add to Distribution : — 



Scotland: Orkney, Loch of Stenness, Mainland, in brackish 



water (G. C. Druce & H. H. Johnston, 1920). 

 To the Exsiccata quoted under the various species add 



" British and Irish Charophytes," Gr. & B.-W. (1924), with the 



following reference numbers : — 



p. 97. Nitella capillaris, No. 1. 



p. 107. N. flexilis v. Fryeri, 2. 



p. 108. N. spanioclema, 3. 



p. 114. N. mucronata, 23, 24. 



p. 121. N. tenuissima, 4, 25. 



p. 127. N. hyalina, 5. 



p. 138. Tolypella glomerata v. 



erythrocarpa, 6. 

 p. 139. T. nidifica, 26. 



ADDITION TO VOL. II. 



p. 86. The name of Mr. E. T. Newton to be added to the list 

 of those to whom thanks are due for specimens and informa- 

 tion. 



120 



