ALGOLOGICAL NOTES. 287 



FLOPJDEiE. 



Acrochcetium microscopicum, Niig. (Andern Poiut). 

 Peyssonelia Harveyana, Cm. (Queen's Ground). 

 Rhododermis elegans, Cm. (Queen's Ground, etc.). 

 Litliothamnion Stromfcltii, Foslie. (Queen's Ground). 

 Peyssonelia Bosenvingii, Schm. (Wembury Bay). 



Those marked thus * are species, or forms, new to science. 



The new species of Acrochcetium is interesting on account of the 

 main part of the thallus being endophytic, the sporangia being raised 

 above the surface of its host Dasya coccinca, on short one — to a few- 

 celled stalks. This plant therefore occupies a place in the genus 

 Acrochcetium similar to that of Rhodochorton mcmbranaccum in its 

 genus. The latter plant, however, is not endophytic, but grows within 

 the polypary of various hydrozoa. A. endophyticum was described in 

 its barren condition at the Liunean Society's meeting of 19th December, 

 1895. The sporangia were not found till January, 1896. 



Cruoria rosea, Cm. f. jyurpurea, Batt. in lit., is probably only a more 

 advanced stage in the life- history of Cruoria rosea, Crn., than had 

 hitherto been recognised. It is so like the figure of Crouan's Cruoria 

 imrpurca that it would have been identified as such by Mr. Batters and 

 myself but for the fact that our solitary specimen showed several inter- 

 mediate stages. 



Cruoriopsis Hauclcii, Batt. in lit., is an interesting member of the 

 Squamariaceffi, dredged off the west end of the Breakwater. The 

 tetraspores showed almost every transition from zonate to cruciate. 

 It most nearly resembles Cruoriella armorica of Hauck (non Crouau). 

 As one of the two species bearing the name of Cruoriella armorica will 

 have to be re-named, Mr. Batters proposes to call our plant as above. 



The other finds do not call for special mention here. 



Certain cultivation experiments were carried on which gave interest- 

 ing results, chieily with regard to the germination of spores. The most 

 important of these was obtained in the case of Ahnfeltia ^j/tca/a, Fr. 

 The nature of the fructification of this alga had not been satisfactorily 

 cleared up, the late Prof. Fr. Schmitz maintaining that what had hither- 

 to been regarded as the fructifying nemathecium was a parasite. His 

 view, however, while widely accepted by algologists, was opposed by 

 Eeinke and others. Specimens of this alga, vichly fruited , were placed 

 alone in a glass jar, in sterilised sea- water, on the 1st February, 1890, 

 and after two mouths (oOth March) a very great number of germinated 

 spores, in the shape of small discs, were found on the sides and bottom 



NEW SERIES. — VOL. IV. NO. 3. X 



