39 
Marine Fungi Imperfecti. 
chains of ovoid or elliptical conidia connected by short necks. 
These are rarely septate. The fertile hyphae form a luxuriant 
growth in most nutritive media. This is similar to what happens 
when infected fronds are kept in moist vessels. Conidia germinating 
in salt water develop a poor mycelium. Often they proceed at 
once to the formation of simple or slightly branched conidiophores 
bearing a limited number of conidia. 
The whole habit of the fungus is characteristic of the genus 
Cladosporium, and so far no spinose conidia, such as described by 
Cooke and Massee, have been found in direct contact with the 
mycelium or its fertile branches, and continued growth in cultures 
and on sterilised fronds properly isolated has failed to produce 
these. In the natural state, by the seashore, however, the fungus 
is usually associated with other Imperfects, some of which have 
verrucose conidia. Two-celled or even four-celled conidia (not yet 
become muriform) of Macrosporium or of Alternaria, are often 
found scattered among the fertile branches of Cladosporium and 
consequently might quite well pass for Heterosporium. More 
numerous, however, are the conidia of a species of Cercospora, and 
the dimensions given by Cooke and Massee agree closely with the 
shorter and stouter dark forms of this fungus, but, although the 
granular contents give its conidia a somewhat rough appearance 
when glanced at casually, their walls are quite smooth. A 
consideration of the evidence would seem to justify the adoption of 
the former name. 
Diplodina laminariana nov. sp. (Fig. 2, 1-5). 
Mycelium hyaline ; pycnidia grouped or scattered, globose or 
slightly flattened, at first immersed but finally erumpent with ostiole 
slightly developed, 110-160/4 in diameter; pycnidiospores hyaline, 
at first continuous, becoming two-celled, elliptical or slightly curved, 
8-12/4 x 3-4-S/4. 
Hah. Saprophytic on fronds of species of Laminaria along the 
coasts of Ayrshire, Dorset and Orkney—probably general. 
This species is almost as abundant as Cladosporium, along with 
which it occurs normally. The mycelium is usually hyaline, but 
becomes faintly coloured towards the base of the pycnidia. These 
occur either grouped or scattered over the thallus as in Fig. 2, 7. 
They appear first as small masses of coiled hyaline hyphae placed 
well beneath the rind of the frond. As they develop and increase 
in size, the outer layer assumes a dark colour. Usually the 
