3Ul) 



joiis. uovi; i'i.n;iisi;\ 



I. terrestris n. f. 



In a sample IVom Hallormstaftir in a fissurc of a rock in Ihc forest, 

 at a place over wliirli walcr was tricklin«^. a remarkable form {^revv 

 whieh 1 lliink slioiilil be relerred lo T Iciuiis. Il roniied exlensive, l'elted 

 eiishions or eoatinj^s about ^/j mm. in lliiekness. Tlie sheatlis firm, to 

 bej^in wilb colourless, later yellowisb brown. Diameter of threads 7— 

 12.3 it. (iiameler of tricliomes 4 — 6.6 //. False branelies are of frequent 

 occurrence; the majorily being of llie 7b////;o//im-l\ pe, a few, liowever, 



Fijj. 14. ToUjpothrix tennis Ag. f. terrestris n. f. (X600). 



of tiie Sc!ilniiem(i-[\pQ. Heterocy.st.s as a rule solitary, at times in pairs. 

 (^ells qiiadralic or sliorler than Ihe diameter. Apical cell of tlie tri- 

 cbome semi-f^lobular. Fig. 14. 



It is distinf^uished from tlie ordinary form of the species by its 

 more vijjorous siicaths, tliinner tricliomes and fre(|uenlly solitary hete- 

 rocysts. Il is perliaps inlhienccd by the particular habitat. 



Tolypothrix limbata Tluiret. 



Hornet et Flaluuilt. Revision III p. 124. 



E. Icel. Vallanes, collected with plankton net which dragged a 

 little on the bottom, temp. 13^' ^Ve 1914. — X. Icel. Ski'itustat'iir, small 

 pond, temp. 19" ^'/t 1914. Grimstai^ir, small |)onds. on old decaying 

 piants -"/t 1914 (2 samples). — S. Icel. Apavatn, in plankton, temp. 

 \\^ 1^8 1914. 



Area: Eur., Afr., .\m., Greenland. 



T. limbaUi has hitherto only been found on about half a dozen 

 various iocalilies and is lluis a "rare" s|)ecies. Most fre(nienlly it oc- 

 curs under similar conditions as 7". Iciiiiis or even in c()mi)any with Ibis 

 species. In Iceland I have cauglit it a couple of times in a plankton 

 net, but it originated undoubtedly in both cases from the bottom and 

 is by no ineans plankton species. 



Tolypothrix helicophila Lemm. 



Lemnici'inann, Kry|)logameiill. d. .Maik Hrandenburg 111 p. 219. p. 

 198 lig. 10. 



N. W. Icel. Botn in Geir|'j6fsfj6rdur, lake, water lo", air 12*^, 

 20/7 1915 (H. J.)! 



Area: Germany. 



In the above menlif)ne(l samjjle a copiously branched Toljipnlhrix 

 occurred; threads 10 12 // in diameter, shcaths geiatinous, and triclio- 

 mes 4—5 // in (ii.uiictcr The sample is jireserved by means of formalin. 

 The species has hitherto only been found by Lemmermann in sonie 

 lakes in Hrandenburg. 



