FROM THE FALKLAND ISLANDS. 161 
ENTEROMORPHA CLATHRATA, J. Ag. Till Alg. Syst. vi. p. 153, sensu lat. 
W. Falklands ; Shallow Bay, Vallentin. 
DisrriB. Cosmopolitan. 
It is curious that this generally distributed plant should not have been 
previously collected on the islands. 
PRASIOLA CRISPA, Ag. Sp. Alg. p. 416. Ulva crispa, Lightf. ex Hook. f. et 
Harv. Е]. Ant. р. 498. 
Е. Falklands; Berkeley Sound, Hooker. 
DisrRiB. Arctic and temperate regions of Europe, Asia, and Africa ; 
Antarctic. 
Fritsch (12 а, р. 127, 12 b, p. 17) has dealt with the occurrence of this 
plant in antarctic regions, and he gives a useful account of the relationships 
of allied forms. The alga is a brackish and fresh-water species, and its 
growth is favoured by ammoniacal pollution. In Northern Europe it is 
often found in fine condition on the rocks below bird-colonies on sea-cliffs. 
In the Antarctic no data appear to have been given with regard to its 
habitat, but the presence of numerous small feathers amongst the “ Scotia” 
specimens from the S. Orkneys is highly suggestive. Letts (13) gives an 
account of experiments carried out with regard to its powers of absorbing 
ammonia (see Bot. Centralbl. Bd. exxv. р. 298). 
ENDODERMA MACULANS, Cotton, sp. nov. (Pl. 6. figs. 1 & 2.) 
Frondes endophyticæ maculas orbieulares 075-1 em. diam. formantes, 
interdum confluentes. Thallus e filamentis articulatis ramosis deinde centro 
in stratum — pseudoparenchymaticum concretis compositus. Filamenta 
radiantia plus minusve porrecta e cellulis 8-12 р, diam. 2-3-plo longioribus? 
Cellule strati pseudoparenchymatici irregulares, angulatæ vel rotundatæ, 
15-20 ш diam., in sporangia mutate. Sporangia irregularia 20-30 ш longa, 
sporis globosis numerosis (16—32 ?) 3-4 ш diam. 
W. Falklands ; in frondibus Nitophylli sp., Shallow Bay, Vallentin. 
The above new species occurred in abundance іп a large sterile frond of 
an indeterminable species of Nitophyllum. It differs from Æ. viride, var. 
Nitophylli, Cotton, in the decidedly larger cells of the filaments, which also, 
for the most part, radiate across the cells of the host instead of following 
the outline of the cell-walls (cf. Pl. 6. fig. 1, and Journ. Linn. Soc. xxxvii. 
pl. 12. fig. 1). А much larger amount of pseudoparenchyma is, moreover, 
developed in the present species, and in this sporangia arise in abundance 
(Pl. 6. fig. 2). 
UROSPORA PENICILLIFORMIS, Aresch. Obs. Phyc. т. p. 15. 
Falkland Islands, teste Gain. 
DisrRIB. N. temperate and Arctic regions, Fuegia (?), Kerguelen. 
