eas ae 
ee 
ON SOME ALG FROM HOT SPRINGS 248 
Var. variabilis (Kiitz.) Kirchn. Crass. fil. 7-2-8-8 p. With the 
ty a 
2. Zygnema sp. Specimens sterile; crass. fil. 185-15 p, cells 
14-21 times leat than the diameter. Kerlingarfdll. 
. Tetmemorus laevis (Kiitz.) Ralfs. Hveravellir, temp. 55° O. 
The Ppdbicianis w were quite normal. This species has been observed 
in the mud of a warm stream in Dominica, West Indies (cfr. West 
a Linn. Soe. (Bot.) xxx. p, 267). 
Cosmarium Holmiense Lund. var. integrum Lund. Hvera- 
vellin temp. 60°C. This Desmid is ieee: fe a Ppieg a type, 
usually preferring a situation am n dripping 
rocks. It is an upland species with a ee sretienicé for cold 
water, and it is rather Strange to find it adapted to a temperature 
0 4 C. 
- Cosmarium angulosum Bréb. Hyeravellir, avneee in a 
a at a temperature of 55° CG. Many of the examples were 
small forms very much resembling the var. concinnum (Rabenh.) 
West & G. S. West. 
6. Cosmarium subarctoum nen Fg in ee Wydz. 
matem.-przy. Akad. Umiej. Krakow i. 1892, p. 385, t. vi. 
4, 
£24, C. globosum Buln. ae wien pean in Wittr. & 
67. 
Nordst. Ale. Exsice. 1883, no. 5 
ong. 12 »; lat. 8— 9 lat. isthm. 67-74 p. 
m 
This small ape greatly resembles C. globoswm in outward 
form, but is very much smaller. It also stands very near to certain 
forms of ©. tinctum Ralfs, but is not quite so large, and is without 
the coloured cell-wall. 
Myxopnyorm. 
‘fe Calothri ix parietina Thur, var, THERMALIS, var. n. (figs. 17-20). 
e 
Aaa vel interdum 2-plo eoleeer hotanavetis basilaribus 
€ 
Crass. fil. 11-19 #3 crass. trich. 6-7-11°5 
n rocks and stones, Hverayellir, tem mp. 24° C. 
This Variety is distinguished from all other forms of C. parietina 
by its thicker and more la amellose shea 
8. Calothrix epiphytica West & G. 8. West. Crass. fil. 7-15 p; 
88°C. trich. 8:5 p; crass. heterocyst. 4°5 ». Hveravellir, temp. 
9. Dichothrix a (Ag.) Born. & Flah. Sheaths golden- 
yellow or bro own ocreate, consisting of man y close lamelle; cells 
Mastigocladus | , 1868, (Syn. Ana ginat 
i i a tu reall Pg i: pcs trich, 8°7-5'1 p 
t2 
