604 SUMMARY OK CURRENT RESEARCHES RELATING TO 



question were S. figuratum Ag. and S. myochrom Ag. They occurred 

 in the following formations : — 1. Patches, half-dry, dark brown, about 

 3 mm. thick, between the cushions of a Schamus ferriigineiis-asaoci&tioii. 

 at the edge of the bog. 2. Cushions on the chalky bottom of the bog- 

 lakes. 3. Tufts epiphytic in strongly encrusted Char a vegetation, or 

 lying loose on the bottom of the bog-lakes. 4. Balls, the true 

 jJEgagrvpila, developed in only one of the bog-lakes. Of these forms, 

 Xos. 2 to -I were found in various stages of development in one and the 

 same lake. 



Green Algae of the Adriatic* — H. Cammerloher publishes a general 

 account of the green algae recorded from the Adriatic, gathered from 

 his own collections and those at Vienna, Trieste, and Rovigno. He has 

 carefully studied all previous work on the morphology, anatomy, 

 cytology, and development of the algaj dealt with here. The book is 

 principally a review of the literature, but it serves as a good guide to a 

 collector in the Adriatic, particularly on account of the excellent figures 

 included. Seventeen families are treated. 



Algae from the Neighbourhood of Greifswald.j — A. Wilczek 

 reports on the algas found in the neighbourhood of Greifswald. Schizo- 

 phyceae occur everywhere ; Oscillatorieas are the most frequent. In May 

 Oscittatoria Frohlichii f . fusca was found singly ; in June it covered a 

 ditch with great balls ; in the middle of July it had almost disappeared, 

 to reappear at the end of August. Instances are given of the spread of 

 brackish and fresh-water species of diatoms, Enteromorpha and Glado- 

 phora. The last two genera are the most strongly represented, even in 

 fresh water. Desmids occur sometimes between other algse, but are rare. 

 Closterium acerosum Ehr. was, however, found in pure cultures. The 

 author's summary of the vegetation in the individual months shows 

 that up to the end of April diatoms are frequent, and their number in 

 individuals surpasses that of any other alga. In May to June is the 

 maximum. At that time appear the Protococcoideae. Early in July 

 Chlorophyceae form the principal mass. Soon afterwards the diatoms 

 appear again in quantity. The beginning of December they disappear 

 entirely. A systematic list of the species recorded is given, as well as 

 tables on the relative frequency of an alga at different localities and in 

 different months. 



"Blasen-zellen" of certain Florideae.f — H. Kylin discusses what 

 he calls the " Blasen-zellen " of certain Florideee. These are special, 

 strongly refractive cells, which occur in the Florideae and have been 

 mentioned by various authors. Those present in Bonnemaisonia aspara- 

 goides, Spermothamnion roseolum, Ceramium tenuissimum and Anti- 

 thamnion plumula are here described in detail. In Bonnemaisonia 

 asparagoides they vary in size from 5-8 /*, and are filled with a homo- 

 geneous, colourless, strongly refractive substance. They are described 



* Die Griinalgen der Adria. Berlin : Borntrager, 1914 (6 pis.). See also Bot. 

 Centralbl., exxix. (1915) pp. 249-50. 



t Mitt. Naturw. Verein Neupomrnern u. Riigen in Greifswald, xliv. (1912) 

 pp. 25-99. See also Bot. Centralbl., exxix. (1915) pp. 275-6. 



X Arkiv f. Botanik, xiv. No. 5 (1915) 13 pp. (figs.). 



