282 K. BROWN, FLORULA DISCOANA. 



of the filaments ; but in a genus where the length of the joints 

 and the diameter vary so much, it is not easy to name from dried 

 specimens. Very much entangled and mixed with Conferva 

 bombycina, *' as a floating scum on freshwater pools close to the 

 " sea and within reach of the spray. June 1867." — R. B. 



Palmellace^. 



8. Hydrurus penicillatus^ Ag., var., parvulus. 



" In filaments (attached to small stones) in the current flowing 

 " from the spring at Lyngemarken ; Sept. This spring maintains a 

 *' uniform temperature all the year round, and remains unfrozen 

 '• during the winter." — R. B. The specimens, in the dry state, were 

 not in a condition to show general outline ; but there can be no 

 doubt about the genus, a comparison with an authentic specimen 

 having been made. The cells (" gonidia," Kutz.) are in lineal series, 

 ovate or oblong-ovate, and with one end, usually the narrower, 

 colourless. I have little doubt that it is a small variety of the 

 above species, which is widely difiused, and varies much in size 

 and branching. In " Nereis Americana," by the late Professor 

 Harvey, it is reported as attaining a length of one or two feet at 

 Santa Fe, New Mexico ; in Northern Europe its size is very much 

 less, and in every respect liable to great variation. In Fries' 

 " Summa Vegetabilium Scandinaviae," it is reported as found in 

 Norway and Lapland. Mr. Brown's discovery of it in G-reenland, 

 in nearly lat. 70° N., is of some interest, when the circumstances 

 are so peculiar. 



OsCILLARIACEuE. 



9. Lyngbya cincinnata, Kutz. 



Abundant in " Lyngemarken Spring. Sept." — R. B. After 

 careful examination, I am constrained to refer this to the above 

 species, which appears to be widely diffused in North Europe. 



10. Oscillaria. 



There are two species (mere fi:'agments), and mixed up with the 

 last, but they are too imperfect for specific recognition. 



Chrooesccace^. 



11. Microcystis, sp. 



Mr. Brown found this on the petrous bone of a Seal lying on 

 damp ground at Egedesminde, in the form of a faint green crust. 

 It may be referred to the above genus, but further I cannot venture 

 to decide. 



During examination of portions of the species already enumerated, 

 the following Desmidieae and Diatomaceae were incidentally 

 noted : — 



Desmidie^. 



Cosmarium undulatum, Corda. Penium truncatum, Breb. 

 C connatum, Breb. ? Closteiium Cornu, Ehr. 



Staurastrum pygmcEuniy Breb. ? 



