100 NOTES ON SCOTCH FRESH-WATER ALG. 
angularibus; membrana cellularum crassa, apni brevibus eres 
(periphericis 7-14) ornata. Diam. sine acul. 15-17 »; diam. 
acul. 18-20 »; crass. membr. 
ti is (Reinsch) Hansg., j occa. ‘Orkney Is. Diam. cum 
proc. 28 pu. 
Chlorococcum gigas Grun. Frequent. 
C. frustulosum Bs : Rabh. B. 
C. humicola (Nag C. 
Gleocystis ampla kite, ) Rabh. , C., §.. Orkney Is. 
G Nag. area cos Tummel. 
G. rupestris (Lyngb.) Rabh. a Orkn: 
este ante gelatinosa A. 'B. 
ella mucosa Kiitz. C. 
Pp hyalina Bréb. 
Eremosphera viridis De Bary. B., C., N., Glen Lochaidh. 
Botryococcus Braunii Kitz. 
Urococeus insignis (Hass.) Kiitz. N., Aberdeen, Orkney Is. 
Palmodactylon sp. §S. e plant ‘observed might have been 
referred to P. subramosum Nag., but the cells gia Breit sSkelibbae 
to elliptical. Long. cell. 5-6 y; lat. cell. 4-5 
Rhaphidium polymorphum Fres., var. Riculare (A. Br.) Rabh. 8. 
—Var. falcatum (Corda) Rabh. B., 8. 
*Geminella interrupta (Turp.) Lagerh. ( Bidrag till Sveriges = 
Flor. S 1, figs. ave)... Long. cell. 11-15-75 yw; lat. cell. 6-8-75 
Fig. 1 len Tum 
ss kdesines bata (anp. ) Kitz. C. 
S. alternans Rein 
8. Gatieulatis tape: var. linearis Hansg. (var. lineatus West). 
8., Ben Chiurn. 
*§. aculeolatus Rei nsch., forma brevior. Fig. 18. Forma cum 
cellulis abla ag ome forma typica. Long. a (c. spin.) 10 p; 
long. cell. (s. spin.) 8 »; lat. cell. 5 a 
Gi oamis (Turp .) Bréb. Sta Edinburgh Botanical 
8. acutus Me eyen. Frequent.—Var. obliquus Gate )Rabh. B.,C. 
Tetraédon minimum (A. Br.) Hansg. Aber 
T. enorme (Ralfs) Hansg. B. 
Class Phycochromacee. 
Sub-class Nostochinee. 
Ord. Nostocacem. 
Nostoe Linckia (Roth) Bornet. A form with pace aae and 
heterocysts rather stouter than in the type. Diam. cell. 3°5-4°5 
diam. heterocyst. 6°5-7°5 ‘ B. 
N. spharicum Vauch. LSP 
N. microscopicum Carm. “a Seg Benn.). B. 
Ana sp. The material was insufficient for determi- 
nation. The filaments were straight, with cells oblong, and one 
and a half times longer than broad; spores cylindrical, mee (or 
very slightly-curved), with rounded ends. Crass, cell. 5 »; long. 
spor, 40-46 »; lat, spor, 12-14 p. 
