74 
BOTANY OF KERGUELEN ISLAND. 
(lermatis structura valde consenticns cum Chroococoo aureo, nihilominus inveni- 
untur cellulm singulas cytioplasmatis valde diversa structura a Chroococcis. Sed 
post observatis cellulis minoribus (Zoogonidiis) sine dubio in cohserentia organica 
cum cellulis majoribus Chroococcoideis, hujus plantulse positio in systemate est 
constituta. Quse cellulaj forma late pyriformi, polo subito angustato, cytiodermate 
tenui, cytioplasmate liomogeneo colore intensive purpureo erant inventse in con- 
sortio cellularum majorum cytioplasmate vacuarum. In singulis cellulis sunt 
inelussB complures cellulse liliales spbaericce colore luteo-purpureo, aliis cellulis sunt 
corpuscula bina (interdum singulum, cellula super.). Nonmdlarum cellularum 
cvtioplasma densissime est repleta corpusculis amylaceis. Chlamydococci species 
duaj cognitie differunt cytiodermate multo tenuiore non lamelloso. Cellulte liliales 
diuB (-t“) ; cellula singula, cytiodermate unilateraliter incrassato, cytioplasmate 
cellulis filialibus {(/onidiis) a. compluribus (A|a) ; cellula singula cytiodermate 
tenuiore, cytioplasmate corpusculis amylaceis densissime repleto (-f-)- Cellula 
minor pyriformis {Zoogonidkmi). 
1. Cosmarium pseudo -nitidulum, Nordstedt, Bydr. till Kaenned. om 
sydl. Norges Besmid. Lund. 1872, tom. ix., p. 46, tab. i., fig. 4) ; var. semicellularum 
semicircularium cytioderma in apioe intus nodulo singulo incrassatum. Longit. 
0,033mm. (^V" Engl.) Lat. 0,0248 mm. (tjV" Engl.) 
In speciminibus singulis in massis minoribus algarum variarum in muscis 
aquaticis adliairentibus. 
2. Cosmarium crenatum, Br(b. var. kerguelense; cellula in ambitu 
late ovali, dianietro longitudinali diametro transversal! paulo longiore (|), semi- 
cellulis subsemicireularibus basi arctissime se adlingentibus incisura non disjunctis, 
mai'gine undato excise, gibberulis truncatulis 14is — 15is instructo, superfleie verru- 
culis in seriebus radialibus dispositis verruculosa, areola media Iscvi, semicellulis e 
vertice visis ambitu ellipticis (in laterum medio leviter tumidis), istbmi latitudo 
!, diametri trausversalis. Diam. transv. 0,033 mm. 5 diam. longit. 
0,039 mm. (yV" Engl.) Istbmi latitudo 0,0067 mm. (y,ty"' Engl.) 
In speoimine singulo observatum inter Vaucheriw et Sohizothrichis carspites. 
(Disteib. Europa, America borealis, Greenlandia.) 
Eormis singulis Cosm. pulcherrimi Nordstedt (Symb. ad Elor. Brasil. Desmid. 
p. 175. tab. iii., fig. 24) simillimum in semicellularum ambitu et forma {C. pid- 
cherrim. ^. boreale, Nordst. Desmid. Spetsberg. et Beoren Eiland. p. 32, tab. vi. 
fig. 14), sed differt semicellulis e vertice visis in medio utrinque non productis, a 
fronte visis in medio lasvibus. 
1. Staurastrum kerguelense, Beinsch in Journ. Linn. Soc. XV. 214; 
semicellulis a latere late trapoziois angulis longe productis, margine terminal! sub- 
recto a vertice visis regulariter trigonis, marginibus lateralibus rectis angulis in 
cornulum rectum margine regulariter crcnulatum longe productis, cornulis summis 
bispinosis, cytiodermate laevi seriebus tribus verrucularum marginibus semicellula; 
