STAURASTEUM. 



213 



126. Staurastrum mucronatum Ralfs in Ann. Mag. Nat. Hist. 1845, p. 1^2, 



t. 10, f. 5, 6; W. & G. S. West, Alg. N. Ireland, 1902, p. 44, 

 t. 2, f. 31. 



Var. subtriangulare W. & G. S. West, Seott. Freshw. Plankton, i, 1903, 

 p. 545, t. 17, f. 11. 



Long. 26-33-5/S lat. sine spin. 29-36-5, cum spin. 34*5-41^ ; lat. ifthm. 

 6-10/,. (PL xv, fig. 20). 



jl a \ )% — Mansang, near Hsipaw (No. 24193). In the Kan-^ryi :it Mudon 



(No. 24505), 



127. Staurastrum leptodermum Lund. Desm. Suec. 1871, p. 58, t. i, f. 26. 



Var. JkapojE (Schmidle) nob. 

 St. Jkapoce Schmidle, Alg. aus Nyassa-See, 1903, p. 74, t. 2, f. II. 



The Desmid described by Schmidle under the name of St. Ikaporr is only a variety of *. 

 leptodermum Lund, with the angles less produced, and with the spine, distinctly larger and inert 

 upwardly directed. The cell-wall is also punctate. 



Forma cellulis paullo angustioribus, spinis interdum paullo minoribus. 



Long, sine spin. 40-42,*, cum spin. 50-54*; lat. 31-33 M ; lat. isthm. IM»1*> 



(PI. xvi, fig. 8). 



Ma b.— Mansang, near Hsipaw (No. 24193). 



unguiferum Turn. Freshw. Alg. E. India, 1893, p. 130, 



128. Staurastrum 



t. 15, f. 18. 

 Var. inekme (Turn.) nob 



St. inerme 



Turn. 1. c. p. 131, t. 17, f 



.x 



Long. 52,; lat. ma,. 26-28,; lat. isthm. 17,. (PI. xvi, «g. 11). 

 ifci.-Mansang, near Hsipaw (No. 24193). _' 



« ■ Turn can only be differentiated from ». unguium by the abeence of ti. Aort 



St .nerve Tun, ean on y ^ ^ .^ rf ^ ^^ 



„al epmes, and >s therefore be g ^ ^ ^^ ^ ^ ^ fcy 



TV,« flnpp.imens observed from tfurma are j ..,,,.._ , fnwoP a- th« 1mm are 



aighter, and towards the ba*» 



The specimen, u. - are ^^ and towftra8 ,ne oue «. 



:rLl" «r \r ^treoted eo g le* are — *" - **» "— 



very faintly 



forma major Turn 



Yer * *""""* T fhe semi cells as in «. unguiferum torma m«,cr *»- 

 over the apex of the semiceiis „_;,„/„/«,« Lund 



port 



narrower, 



x ui WO — ^ comiculatum Lund., but is proportionate^ 



t/emm var. inerme is very closely am It is also interesting to not* the 



the angles more V^^f"^ var . 8 . nigerum We*-which ocur. in 



eristenee of a epinate form of «. «r»»«"» 



and Australia. 



129. Staurastrum unicorne 



f. 16. 

 Var. ceylanicum 



w 



Turn. Freshw. Alg. E. India, 1893, p. 107, t 16 

 & G. S. West, Freshw. Alg. Ceylon, 1902, p. 176 



t. 21, f. 16, 17 



Forma spinis rectis extrorsum ^ cum gpm . ^ 



Long, sine spin. 30* cum spin. 35-38,*, . 



lat. isthm. 6*4* (PL *?!, fi S- 2) ' - 



