386 THE JOURNAL OF BOTANY 
Var. ROBUSTUM, Var. (di. zig-zag forma West & G. 8. West 
- Roy. Mier. Sol 1897, p. 472.) Var. filis longioribus pluri- 
cellularibus, cellulis leviter crassioribus ; ; antheridiis bicellularibus. 
Crass. = noe 19-23 »; altit. 2-4-plo majo 
vs 58-58 os » 50-56 p; 
- oospor. 51-56 3 ,, 47-58 p; 
antherid. 19; ,, 5°5-6°5 p. 
Hab. "Harefiala Middlesex. 
cells; the antheridia are, moreover, unicellular. The Middlesex 
plants were slightly se, with much longer filaments and con- 
ridia 
18. Gi. oie (is Cl.) Wittr., 2. c. 1870, p. 182; Hirn, 
l.c. p. 217, t. 86, f. 228. Prolifera Borisiana Le Clerc, 1817. 
Crass. cell. veget. a 19 p»; altit. Eid! plo major ; 
42 p 4-plo - 
” », suffult, ” 
>  oogon. Rae hs gy ae 3 
9 spor 49-58 ED oe 49-58 p; 
antherid 17 p 
125-18 p. 
~Near Senens, Garaael: abundant amongst Gi, Boscii 
(Le CL) Wittr. and CZ. ciliatum ase: on gsh. 
omg of the oogonia were term 
. Gi, pecierens Wittr. J. c. 1s, p. 126; Hirn, l.c. p. 266, 
t. pr f. 283. 
Crass. cell, ar 10-12 p; altit. 5-7- - ere 
¥ 33-35 p; 82°5-8 
oogon 
i> oospor. 31-325 w; ,, 24-96 
anti erid. Ons 9 5-12 
andr. 6-7 p 7p 
Hab. Rear Banus Gorivtonll amongst a. dsdeun (Hass.) 
Pringsh 
15. Mon nostroma membranacea, sp.n. M. thallo mem- 
ranaceo, expanso et lubrico, pallide viridi, margine plerumque 
laciniato ; cellulis subquadratis vel polygonis, confertis, in sectione 
transversa verticaliter suboblongis ; chromatophoris parieta- 
libus, singulis, cum pyrenoide singulo. sang: thall. usque ad 
a ; tall. rte Binge. seth Sit 
e som: 
_ fairly regularly, but more often they are polygonal, compact, and 
have no regular arrangement. Ina verse section of the thallus 
the are more or less oblong, with their long axis veetieally 
sposed. is 18 a single parietal chromatophore in each cell, 
usually covering a large part of the interior of the sete -wall, and it 
contains one pyrenoid. 
. 
