FRESHWATER \l.t;.l FROM JUAN FERNANDEZ AND EASTER ISLAND Sy 



Size: long. 41 — 46 (j.; lat. 29 — 33 [j,; lat. isthm. 12 15 [j.; crass. 24 <i 

 Masatierra: among mosses on wet rocks in Pangal. 



A) to of distribution: probably -ubiquitous, known from Europe, Arctic 

 Countries, Asia, Africa, North and South America. 



2. Cosmariuin hunaile var. striatum (Boldt) Schmidle. 



Schmidle: Beitr. Alpin. Algen; Cos mar turn striatum Boldt: Siber. Chloroph.; 

 W. & C. S. West: British Desmid. Vol. III. 



This Desmid is represented with a few specimens in the same sample as 

 the preceding. The forms are typical of the variety. 



Size: long. 15 [j.; lat. 12 [j.; lat. isthm. 4 [x. 



Masatierra. 



Area of distribution: Europe, Asia, North and South America, but pro- 

 bably even more widely distributed. 



Family Zygnemaceae. 



Genus Zygnema Ag. 

 3. Zygnema sp. 



Sterile specimens of Zygnema are present in a couple of samples. 

 Masatierra: in a brook. Masafuera: in a brook with slowly running water. 



Distribution of the genus: ubiquitous. 



Genus Spirogyra Link. 

 4 & 5. Spirogyra sp. 



At least two sterile species of Spirogyra were observed. The one was 

 a large form 70 — 80 \>. broad, the other a slender species. 



Masatierra: Colonial Valley; Masafuera; Easter Island. 

 Distribution of the genus: world-wide. 



Order Oedogoniales. 



Family Oedogoniaceae. 



Genus Oedogonium Link. 

 6. Oedogonium sp. 



Specimens of Oedogonium are widely distributed in all the islands, but 

 invariabily they were sterile. 



Masatierra; Masafuera; Easter Island. 

 Distribution of genus: world-wide. 



