78 BANGIACEAE 
Coker 106 p.p. (type); in same locality, on Lessonia nigrescens, 
with Acrochaetium polysporum, Coker 197 p.p.; in same locality 
and habitat, on Glossophora Kunthii, July 13, 1908, Coker 493 
р.р.; on Glossophora Kunthii in beach drift, La Punta, region of ` 
Callao, December 1906, Coker 23 p.p.; оп Glossophora Kunthit, 
"in the surf," Island of San Lorenzo, region of Callao, Feb. 5, 
1907, Coker 57 p.p.; on Spatoglossum crispatum, Islands of Lobos 
de Afuera, Mar. 27, 1907, Coker 145 p.p. 
The plants brought together in the above description and cita- 
tions include a wide range of forms yet represent, we believe, con- 
ditions of growth and development of a single species. In the 
specimens on Chaetomorpha and Cladophora the disc or horizontal 
thallus has a remarkable development (FIGURES 8-10) and may 
produce spores whether erect filaments are present or not. These 
thalli in many places almost wholly cover the surface of their 
hosts, accompanied here and there by Dermocarpa, Chlorogloea, 
and other epiphytes. The erect filaments in these cases are of | 
rather rare occurrence, are only 50-250 и long and usually consist 
of a single row of cells (FIGURES 8 and 11), though filaments four ` 
cells in greatest width (FIGURE 12) also occur; in no case on these | 
two hosts have spores been observed in the erect filaments. In 
the specimens epiphytic on Glossophora and Геззота, the disc, 
while of the same general character, has a less luxuriant develop- 
ment and the erect filaments attain larger dimensions, becoming 
finally 850 и long and 2, 4, and occasionally 8 cells in greatest 
width (FIGURES 13 and 14) and in the size and structure of the 
filaments these specimens show an apparently perfect series of 
gradations between the short simple ones of the C haetomorpha 
and the more luxuriant ones just described. In these specimens 
on Glossophora and Lessonia we have observed, no spores, either 
in the disc or in the filaments. The specimens on Spatoglossum 
are much crowded by other epiphytes (Acrochaetium, Streblonema, 
etc.) and the disc has no such wide extension as on Chaetomorpha 
and Cladophora, but the erect portions have the best development: 
that we have noted for the species, becoming as much as 1.3 mm, 
long and often 8 cells wide, though the younger of these filaments 
appear to be identical in character with the simple ones that 
spring from the large discs on the Chaetomorpha and C 
