202 SUMMARY OF CURRENT RESEARCHES RELATING TO 
symbiosis with Schizophyceae. A discussion follows on the possible 
application of Dollo’s law to physiological phenomena. Both the alga 
Geosiphon and the rhizopod Paidinella represent a new type of symbiosis, 
and support the views of Schimper, Mereschowsky and Lauterborn on 
chromatophore symbiosis. E. S. G. 
Formation-biology of the Algae of the Zehlan Fen in East 
Prussia. — F. Steinecke {Arch. Hydrobiol. Planktonic ., 1916, 11, 458- 
77, 10 figs. ; see also Bot. Centralhl ., 1919, 140, 264). A repetition of 
a former account of this somewhat inaccessible region, published by 
the same author in 1915, and abstracted in this Journal. E. S. G-. 
Fresh-water Algae from Juan Fernandez and Easter Island. — 
K. M. Strom {Nat. History of Juan Fernandez and Easter Island , ed. 
by C. Skottsberg, II., Upsala, 1921, 85-93). A record of twenty-five 
species, including two Desmids. Very few came from Easter Island. 
The material was collected by Dr. Skottsberg in 1916-17 during the 
Swedish Expedition to the Pacific. The majority of the algae are 
ubiquitous species. The Myxophyceae are represented by thirteen 
species. One of these, recorded as “ Oscillatoria sp.,” bears a striking 
similarity to 0. terebriformis f. tenuis (W. & 0. S. West), hitherto only 
known from Cape Royds, Victoria Land. The filaments were very 
little if at all terebriform, but this character was also not very striking 
in the Antarctic specimens. E. S. Gf. 
Catalogue of Fresh-water Algae Collected in the Caucasus : 
A. A. Elenkin and V. P. Savicz in the Czernomorsk Region during 
the Summer of 1912. — A. I. Lobit {Bull. Jard. imp. bot. Pierre le 
Grand , 1915, 15, 23-47, 6 figs.; see also Bot. Gentralbl., 1918, 137, 
.235). A record of sixty-five species, with notes. Two new forms are 
described in Russian : Spirogyra ternata Rip. f. gagrensis, and Gosmarium 
Jiolmiense Lund f. caucasicum. Scytonema tolypotrichoides Kiitz. is 
regarded as a variety of S. mirabile Bornet. Figures are given. 
E. S. G. 
The Germination and Development of some Marine Algae. 
I. Porphyra. — K. Yendo {Bot. Mag. Tokyo , 1919, 33, 73-93, 1 pi.). 
The first of two important reports published before the death of the 
distinguished author. His problem was to determine, if possible, what 
happens to “ annual marine algae ” during their resting period, when 
they are not in evidence ; and a further mystery is what at such a time 
becomes of the epiphytic and endophytic species proper to “annual 
algae.” The subject of this paper is Porphyra , as represented by two 
littoral species, P. leucosticta var. suborbicidata (Kjellm.) and P. linearis 
Grev., which grow richly from December to May near Oshoro Cove, 
where the Marine Laboratory of Hokkaido Imperial University is 
situated. A suitable block of concrete was erected, conforming in all 
necessary details to natural reefs, and bearing on the surface a number 
of knobs which could be detached for examination at stated intervals. 
.Sporelings of Porphyra were found on Oct. 27, the youngest being 
single cells, roundish elliptical. These sporelings increase in length 
and divide, developing into the young plants already described by 
