Marine Fungi Imperfecti. 47 
free upon the surface and, while mixed with the conidia of 
Cladosporiutn, for which the material had been collected, were 
invariably associated with a distinctive type of conidiophore. The 
difficulty of obtaining them attached in sections, added to their 
occurrence with other fungi, rendered cultures imperative. Agar 
extract of Laminaria proved most successful. The fungus was 
separated and fruited readily, forming the chains of conidia which 
distinguish the genus Alternaria from Macrosporhun. 
Similar conidia have since been found on the surface of 
freshly collected seaweed from the tidal zone, but as no mycelium 
could be found, there seems little doubt that this species is a 
saprophyte confined mainly to the zone above tide mark. 
The mycelium, which varies from 2—8/x in diameter, is diffused 
and hyaline when immersed in the tissue ; aerial branches are brown. 
The same applies to mycelium grown in cultures. Erect 
conidiophores spring from the surface, ending in the slightly 
swollen tips shown in Fig. 5, 5. On the fronds exposed to frequent 
periods of drought, these are short and simple, but, under the more 
even conditions experienced in cultures, they are usually longer and 
may be branched, forming a dense olive-green or brown felt over 
the surface. The conidia, grouped in chains, differ much, both in 
size and shape. At first olive-green, they become dark brown with 
the formation of a thick warty coat. The number of transverse and 
longitudinal septa varies considerably as well as the length of the 
neck-like apex, by which the conidia are attached to one another 
(Fig. 5, 6). The cell or cells forming the latter are frequently 
smooth-walled (Fig. 5, 7). This probably happens in the case 
where one conidium is well developed before the next in succession 
appears. Then the smooth neck cell is budded off before the 
formation of the next conidium. 
The chains may be either simple or branched, in the latter 
case, the side chains arising either from neck cells or by the 
budding of any body cell on the side of a conidium. Usually they 
arise in succession and show successive stages of development, but 
frequently a number of almost equal small conidia are budded off 
quickly, and then increase in size. In this case the greatest 
development is not always found at the base of the chain (Fig. 5, 5). 
EPICOCCUM MARITIMUM nov. sp. (Fig. 5, 8-10). 
Mycelium localised; sporodochium hemispherical or pulvinate* 
aggregated on pink or reddish spots; fertile blanches short;conidia 
globose, reddish-brown, roughly verrucose, 17—20/x in diameter. 
