FRESHWATER ALGÆ FROM TUDDAL IN TELEMARK. 173 



139. Cosinarium Hohniense. Lund. 

 var. integrum. Lund. 



Not uncommon, but scarce. 



140. Costnarium venustum. (Breb.) Arch. 

 General and sometimes in quantity. 



140 a. forma minor. Wille. 



As common as the type. Size: long. 23,5 & 24 /ii, lat. 18 

 à 20.5 .«, lat. isthm. 5 a. Fig. 14, PI. IV. 



141. Cosmarium globosum. Bulnh. 



Rare. Size: long. 30 a, lat. 20 /n, lat. isthm. 16,5 fi. 



142. Cosmarium subarctoum. (Lagerh.) Racib. 



Not uncommon. Also between Zygnema in brooks. Size: 

 long. 12 7 & 15,«, lat. 10 & 11,2,«, lat. isthm. 6,5«. Pl. IV, Fig. 11. 



143. Cosmarium pseudarctoum. Nordst. 

 Somewhat rare 



144. Cosmarium pseudardoides. nob. 



? Cylindrocystis minutissima. W. B. Turner: Algae aq. dulc. 

 Ind. orient. 



Turner has 1893 described a desmid from east India as 

 ? Cylindrocystis minutissima n. sp. Turner writes : Gyl. parvissima, 

 circa duplo longior quam lata, utrinque rotundata, paullo in 

 mediam partem incurvata. Membrana glabra, apicibus rotundatis. 

 Long. 12—13, lat. 6,5 — 7 /n. Nearest to Gyl. Tatrica Racib., 

 from which it differs principally in being slightly constricted, 

 and also smaller in size. From the remnants of endochrome 

 I judge it to be a Gylindrocystis. 



Messrs. West give almost the same description as Turner. 

 (Brit. Desmid. vol. I.) Both Turner and West give figures of 

 the species. The figure of Turner is not good, and that of 

 W^est is drawn to a very small magnification with regard to 

 the minute object. I have examined a form, which occurred in 

 a sample from Tuddal. It agrees good with the figures . of 

 Turner and West, and exactly with the measurements. I could. 



