Nov. 1904,] BOTANICAL SOCIETY OF EDINBURGH. 13 
Order CLADOPHORALES, 
Family CLADOPHORACE2, 
Genus RHIZOCLONIUM, Kiitz. 
25. R. hieroglyphicum, Kiitz ; em, Stockm. 0O,.—Near Kirkwall. S.— 
Near Loch Clickhimin. 
Genus CLADOPHORA, Kiitz. 
26. Cl. glomerata (L.), Kiitz. S.—Near Scalloway. 
27. Cl. crispata (Roth), Kiitz. O.—Hoy ; Kirkwall ; Stromness. 
28. Cl. flavescens, Ag. O.—Near Kirkwall. 
Order CONJUGAT&. 
Family ZyYGNEMACE&, 
Genus MouUGEOTIA, Ag, 
29. M. elegantula, Wittr. OU.—Hoy. 
Many sterile species of this genus were obtained from bog-pools 
and ditches, and also from the plankton. 
One species from near Scalloway, Shetlands, possessed a purple 
cell-sap, and short lateral branches were developed at irregular 
intervals along the filaments. Crass. fil. 11—-12u. 
Genus DEBARYA, Wittr. 
30. D. glyptosperma (De Bary), Wittr. Crass. cell. veget. 11°5-13u ; 
Long. spor. 53-624; lat. spor. 42-484. S.—Plankton of Loch 
Beosetter, Bressay. 
Genus ZYGNEMA, Ag. 
31. Z. erwcetorum (Kiitz), Hansg. S.—Near Lerwick ; near Scalloway. 
32. Z, insigne (Hass.), Kiitz. Cells 14—twice longer than their diameter ; 
zygospores subglobose or ellipsoid-globose ; crass cell. veget. 
27-30n ; long. zygosp. 32-334; lat. zygosp. 29-304. S.—Near 
Scalloway. 
33. Z. Vaucheru, Ag., var. subtile, Rabenh. Cells 25-3 times longer than 
their diameter ; zygospores ellipsoidal ; crass. cell. veget. 17-18 ; 
long. zygosp. 32—35u ; lat. zygosp. 18-204. S.—Near Scalloway. 
34, Z. stellinum (Vauch.), Kutz. ; var. cylindrospermwm, var. n. (figs. 2-5). 
Var. cellulis 25-3}-plo longioribus; zygosporis oblongis vel. 
oblongo-eylindricis, polis late rotundatis ; membrana mediana 
zygospore dense et minute scrobiculata. 
Crass. cell. veget. 15-164; long. zygosp. 23-44u ; lat. zygosp. 
15-17°5u. 
S.—Plankton of Loch Asta. 
This variety is at once distinguished by the cylindrical form 
of the zygospores. 
Genus sprroGyRa, Link. 
35. Sp. jugalis (Dillw.), Kiitz. Cells 13-3 times longer than their 
diameter ; spiral chloroplasts 3 in number, with serrated edges 
and with large pyrenoids. Crass. fil. 90-97u. The specimens 
were conjugating, but the zygospores were unripe ; dimensions of 
unripe spore, 135 x 904. S.—Bressay, in a ditch. 
