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CHAETOMORPHA 37 
of the unattached specimens that we аге somewhat doubtfully 
identifying with C. cartilaginea; the thickness of the cell wall in 
Chaetomorpha evidently varies with the age and state of preserva- 
tion of the specimen, but we never have seen the walls so uniformly 
and strongly thickened in any specimens identified with C. aerea 
or C. Linum. 
Chaetomorpha cartilaginea doubtless finds its closest relative in 
С. antennina (Bory) Kiitz., of which C. pacifica Kütz. is probably 
a synonym. With C. antennina, C. cartilaginea agrees in the 
nature of its holdfast and in the character of the basal cell it 15. 
perhaps nearer to that than to the C. aerea group. But the basal 
cell of the genuine C. antennina* is much longer and more highly 
* The type of Conferva antennina Bory (Voyage dans les quatre principales iles. 
des mers d'Afrique 2: 161. 1804) from Ile Réunion (Bourbon) is preserved іп the 
herbarium of the Muséum d’Histoire Naturelle at Paris and we have been allowed the 
privilege и examining it through the courtesy of Professor Mangin and Monsieur 
Hariot. Its filaments are 4—9 cm. long, flaccid above the rigid one-celled base, much 
crumpled, collapsed, and contorted towards the apices; the basal cell is commonly 
о more than 15 mm. long, 20-40 times longer than its average di- 
ameter, increasing in diameter from about 150-200и at base to 500-5804 above, 
though the filament above the basal cell is more slender, being mostly 270-4004 in 
diameter; cells above mostly 24-1 times as long as broad, чирү, ees at 
most of the septe: кен жү. печен of e parts, usually 6-іби a 
least, of xi во the West Indies des a much shorter 
basal cell than the Réunion doe: the cells in the upper part of the filament are rela- 
tively = and the diameter of the filament above is commonly greater; it should 
probably be known as среща media (Ag.) Kütz. 
Chaetomorpha pacifica Kütz. (Sp. Alg. 379. 1849) was established on a speci- 
men from Java collected by pared and one from St. Augustin, Mexico, collected: 
by Liebmann. Of these, the specific name might indicate that the ал Augustin plant 
should be preferred in selecting the technical type, though when К 
figure the species the Javan plant was apparently chosen for the purpose. We have 
seen the St. Augustin specimen through the kindness of Mme. Weber-van Bosse and 
think it would be impractical to try to distinguish it specifically from С. ae 
even though there are certain differences, the principal being that the cell walls ar 
often thicker and delaminating with age, even though the cells of the filament i in eae 
dried condition are crumpled, collapsed, and contorted almost to the basal cell; the 
filaments are also stouter above than in the type of С. antennina, having mostly 
“weas as of 500—630 
Chaetomorpha ыы (ЕНІ, Lyon) Wille [in Engler & Prantl, Nat. Pflanzenfam. 
12: Ма sae 118. 1910—Chaetomorphopsis pacifica Н. L. Lyon, in Tilden, Am. 
Alg. no. 458. 1901] from Hawaii, seems, by a happy с chance, to be not very different 
from the earlier-published Chaetomorpha pacifica Kiitz., though the basal cell is less 
elongate and specialized, being mostly 4-10 mm .long. Тһе filaments are described 
as having a diameter of 500-800и; in the single rather small specimen that we have 
