Mil. W. AltClIElt OX FRESHWATER ALGUE. 445 



T. CRUKNTULUM, Nyl. 



" Forsan subspecies Try pet he Hi cruenti, Mat., Nyl. Pyrenoc. p. /3, a 

 quo differt praecipue sporis miuoribus (longit. 0018-0025 milium, 

 crassit. 0008-0011 millim."— Nyl. in litt. 



On the branches of trees; probably common. Coll. Balf. no. 2240. 



- 



PYRENASTRUM AMEIUCANUM, Spi\ 



On the thin bark of trees ; perhaps not uncommon. Coll. Balf. no. 

 2274. 



In addition to the above, there are traces of various other and 

 chiefly crustaceous Lichens in Dr. Balfour's collection. These. 

 however, appear in most cases with sterile thallus, or occasionally 

 with apothecia not rightly developed ; so that they are wholly in- 

 determinable. 



COOTJUBUTIOXS TO THE BoTANY OF H.M.S. ' Ch ALLEN GEE.' 



XXXI V. Note on the Freshwater Alga? collected bj^li. N. 

 Mo&eley, M. A., in Kerguelen's Land. By W. Abcheb, F.K.S., 

 M.li.I.A. Communicated by Sir J. D. Hooker, M.D., Pres.K.S. 



[Bead June 15, 1876.] 



On looking over the Freshwater Algae collected at Kerguelen's 

 Land by Mr. Moseley, one experiences a feeling of disappointment 

 that not any should have presented fructification, and hence, in the 

 few diverse forms occurring therein, the specific identity, especially 

 as relates to Chlorophyllaceous types, remains uncertain. As re- 

 gards these, however, there is no a priori reason to suppose that 

 they are in reality in any respect different from the similar forms 

 which are sufficiently common at home. However, considering 

 the extreme distance of Kerguelen's Land from any continent, 

 and its great remoteness and isolation, that its commonplace 

 freshwater-algal flora should not be different from our own in 

 this quarter of the globe is in itself a fact not without its interest. 



The collections being put up in strong methylated spirit 

 of wine was against the maintenance of the characteristic 

 appearance of some of the specimens ; but the genus at least was 

 always recognizable. It might be a question whether a much 

 smalkr proportion of the spirit, with a little glycerine added to 

 the water taken up with the gathering, might not on the whole be 

 a more suitable medium than the strong spirit. 



The bottles contained at least two forms of Spirogyra, probably 



