54 PLANTS FROM NEW CALEDONIA. 
STIGONEMACE E. 
MASTIGOCOLEUS OBTUSUS, sp. nov. (Pl.4. figs. 7-9.) M. filis inæqualibus, 
ramosissimis ; ramis biformibus, his brevibus crassis, apice obtusus, illis 
longis flagelliformibus, sspe ramosis; trichomatibus quam filum triplo 
angustioribus valde irregularibus et crassitudine inæqualibus ; cellulis 
irregularibus subquadratis vel diametro longioribus, contentu pallide æru- 
gineo; tegumento crasso inæquali, hyalino, hine inde constrieto, ibique 
lamellis latius divergentibus preedito,alibi homogeneo; ramulis flagelliformibus 
tenuiter et solide vaginatis nee manifeste septatis, heterocystis nullis. Diam. 
fil. 25-383 crass. trich. 4-14; long. cell. 9-30; long. ram. flagelli- 
form. ad 800 u; crass. 2-7 u. 
Mont Canala; forming a thin, slimy, almost invisible film together with 
Gloothece Vibrio and Rosaria ramosa over excrescences on trees. 1181. 
This species is sufficiently distinct from the only other species of the genus 
by virtue of its thick hyaline sheath, and the irregular form of the cells and 
filaments. Futhermore, unlike Mastiyocoleus testarum Lagerh., its whip-like 
branches, which may themselves be branched, are provided with a sheath 
throughout their whole length, and although the contents of these slender 
branches may be distinctly septate at the base, for the greater part of their 
length, septa cannot be distinguished. The complete absence of hetero- 
cysts is another noteworthy feature, and one which necessitates a revision of 
the generic description. 
MAsticocoLeus Lagerh., char. emend. 
Fila libera irregulariter ramosa; artieuli preter ramigeros unica cellula 
constantes. Rami biformes, partim cylindrici, partim flagelliformes in pilum 
attenuati, Vagina continua. — Heterocystz  singule sæpe pedicellatæ 
rarissime bins, terminales vel laterales, nunquam intercalares ; interdum 
nulle. Multiplieatio hormogoniis (et cellulis chroococcoideis?).  Sporæ 
ignote. Contentus cellularum homogeneus. 
ROSARIA, gen. nov. 
Planta filis vere ramosis, cellulis moniliformibus uniseriatis, ramis ramulis- 
que quaquaversus divergentibus, diametro filo subæqualibus, apicem versus 
leviter attenuatis, vagina plerumque nulla, heterocystis nullis. 
ROSARIA RAMOSA, sp. nov. (Pl. 4. figs. 2-6.) R. filis longis ramosis 
plerumque evaginatis, ramis longioribus ramulisque præditis, cellulis ferme 
sphæricis membrana solida nec mucosa, contentu pallide ærugineo lucemque 
magnopere refringente, nonnullis magnis guttulis oleosis instructo; hetero- 
eystis nullis. Diam. cell. 13-19 a; long. cell. 19-22 u. 
Mont Canala ; forining a very thin mucous film together with Glwothece 
Vibrio and Mastigocoleus ramosus over exerescences on the bark of trees. 
1151. This is a peculiar and beautiful alga which looks like a string of 
