45 
Marine Fungi Imperfecti. 
long, attenuated type. These are nearly hyaline and borne at the 
end of short conidiophores tinged with light yellow. Frequently 
such conidia proceed directly to form other short fertile branches 
terminating in similar types (Fig. 4, 4). 
In many cases terminal or lateral swellings have been noticed 
on the mycelium. These increase in size and become divided by 
septa. In vigorously growing cultures, abundantly supplied with 
food material, some of these have been seen to form starting points 
for the development of fertile branches. They usually contain 
darker contents than the adjoining hyphse. In a drop culture of 
salt water, to which a trace of lactic acid had been added, a stunted 
mycelium, devoid of conidia was produced. These swellings, 
however, appeared and, increasing in size, became divided by 
numerous septa to form hyaline cell masses which in their early stages, 
produced one or two hyphae, but ultimately became darker, and, 
owing to the bulging of the cells, assumed the form of a small 
grape bunch. This development is shown in Fig. 4, 5. These 
peculiar masses are still under observation. So far no attempt has 
been made to produce the conidia normally formed. It maybe that 
they serve very much the same purpose as chlamydospores. The 
addition of lactic acid does not explain them, as similar drop 
cultures with the same quantity of lactic acid have produced normal 
conidia. 
When grown on dry material above tide mark, the dark, stout 
thick-walled conidia might be regarded as belonging to Helmintho- 
sporium, but the type and habit of conidiophore, as well as the 
arrangement of conidia is distinctly that of Cercospora. 
MACROSPORIUM LAMINARIANUM NOV. SP. (Fig. 5, 1-4). 
Mycelium immersed in sub-stratum, with few creeping surface 
branches; fertile hyphae erect, simple, flexuous, sometimes nodulose 
terminating in swollen tips; conidia large, oblong or broadly ovate, 
reddish-brown, verrucose, 35-70/a x 16-25/a. 
Hab. Saprophytic on fronds of Laminaria, Dorset and Orkney. 
Irregular spots both on dry and moist fronds are sparsely 
covered with this fungus, whose mycelium is very large, sometimes 
reaching a diameter of 15/a, hyaline when immersed, or reddish- 
brown on the surface. The fertile hyphae are simple, rarely 
branched, more or less erect, smooth or nodulose, terminating in 
head-like swellings of a bright colour (Fig. 5, /). The thickening of 
the walls of the swelling and of the remainder of the apical cell is 
