CLADOPHORACEAE 29 
being, as a rule, externally very smooth, in the septa being thick 
and distinct, in the absence of sporangia, and presumably also in 
being coarser and less branched. In respect to the form of the 
cells and the thickness of the septa and the outer walls, Dr. 
Coker’s plants suggest Hariot’s figure (from authentic Chilean 
material) of the earlier-published Мустета ? flava Hook. & Агп., 
though the cells are ordinarily smooth. The filaments are very 
sparingly branched and are mostly 18-36 и (occasionally as much 
as 44 и) in diameter; the cells are 1-2 (rarely 3) times as long as 
broad, the septa 4-18 и thick, the outer walls 4-10 u thick. Ке- 
production, in our material, appears to occur only by akinetes 
and aplanospores. Usually, in reproducing, the cells of a filament, 
or of certain parts of it, round off and separate, often showing a 
single transverse division before actually being freed from the 
filament sheath. These cysts then commonly appear to undergo 
division in two or three planes before new filaments are formed. 
It rarely happens, also, that certain cells of a filament divide 
endogenously, giving rise to several ovoid aplanospores, similar 
to those figured by Meyer for Т. umbrina (Bot. Zeit. 671: pl. 2. 
f. 44-47. 1909), though sometimes more numerous. 
Chroolepus peruvianus Kütz. (Phyc. Gen. 284. 1843) was de- 
scribed from “ Felsen des peruanischen Hochlandes, mit Rocella.” 
Its occurrence with Косейа probably indicates that it was found 
not far from the coast. It is described as obsoletely articulate, 
so it cannot agree very well with Dr. Coker's specimen that we 
have discussed above. Kiitzing later referred the plant со 
Chroolepus flavum у sterile (Sp. Alg. 428. 1849) and De-Toni 
(Syll. Alg. r: 240. 1880) cites it under Trentepohlia villosa f. 
rigidula (Kütz.) De-Toni. 
Bulbotrichia peruana Kütz. (Sp. Alg. 429. 1849; Tab. Phyc. 
4: 22. pl. оў. f. III. 1854), “Peru, ad rupes," "Auf Kalkfelsea 
in Peru," appears to be an organism of doubtful affinities, though 
probably of the Trentepohlia alliance. 
Family CLADOPHORACEAE 
CLADOPHOROPSIS Borg. Overs. Kzl. Daoske Videnskab. 
Selsk. Forh. 1905: 288. 1905 
