Freshwater At gee of S. of England. Bg W. & G. S. West. 475 
Sub-fam. Conferve.®. 
Genus Conferva L. ; em. Lagerb. 
1. C. bombycina A g. Generally distributed and abundant. 
Forma minor Wille. General and abundant. 
2. C. Baciborskii Gutw. Y I. N. 
Genus Microspora Thur. ; em. Lagerb. 
1. M.floccosa (Vaucb.) Tbur. I. Ep. II. Ha., Pi. 
2. i¥. Wittrockii (Wille) Lagerb. III. C. 
3. M. abbreviata (Rabenh.) Lagerb. II. Pi. 
4. M. fontinalis (Berk.) De Toni. VII. Street. 
Earn. Chroolepidaceae. 
Genus Microthamnion Nag. 
1. M. strictissimum Babenb. 1863. (M. vexator Cooke 1882). 
I. Ep. III. B, Br., Di., Ew., M., Pt., Wi. YI. N. 
There is no doubt that Cooke gave tbe name M. vexator to tbe 
plant previously described by Babenborst as M. strictissimum. Dr. 
Nordstedt (in K. Sv. Vet.-Akad. Handl., Bd. xxii. No. 8, p. 15) sug- 
gests that they are identical. Cooke (Brit. Fresbw. Alg., p. 188) 
states that his species is “ very much more slender than M. strictis- 
simum, ” and gives as tbe diameter ’003 mm. Nordstedt’s measure- 
ments of M. vexator are 3-4 //, (diam.) Eabenhorst’s measurements 
of M. strictissimum are 1/700-1/600 of a Paris line ( = 3-4 f) ; 
therefore Cooke, in giving tbe above statement, must have made a 
mistake in converting Babenborst’s measurements to mm. 
*2. M. Kiltzingianum Nag. I. Ep. III. E., Pu.,'Rp. IY. Cb. 
Earn. Cladophoracese. 
Genus Cladophora Kiitz. 
1. C. flavescens Ag. II. Wb. III. Cr., Ba. 
2. C. crispata (Both) Kiitz. II. No. III. Bb. 
3. C. glomerata (L.) Kiitz. II. Ha., Hy. YI. N. 
Ord. Conjugates. 
Fam. Zygnemaceae. 
Sub-fam. Mesocarpe.e. 
Genus Mougeotia Ag. 
; 1. M. scalaris Hass. III. Ew. 
2. M. recurva (Hass.) De Toni. YI. N. 
3. M. par vula Hass. I. Ep. III. Ew., Wi. VIII. T. 
4. M. genuflexa (Dillw.) Ag. II. No., U. III. Ew., Wi. 
YI. N. 
