4 6 
Geo K. Sutherland. 
interesting ; only that portion in contact with the conidium remains 
thin (Fig. 5, 3). Continuation of growth may take place as in 
Fig. 5, 4. 
The conidia are borne singly and each possesses at the basal 
end a distinct dark-coloured scar of attachment or hilum. They 
vary from a short oval type, 35 x 25//, to a long oblong form, 70 
X 16//. (Fig. 5, 2). At maturity their walls are thick, reddish-brown 
and verrucose. Altogether the conidia are easily distinguishable 
from the similarly muriform and verrucose ones of a species of 
Alternaria, along with which they frequently occur. Nor can they 
be confused with those of Macrosporium Pelvetice. 
Alternaria maritima nov. sp. (Fig. 5, 5-7). 
Mycelium diffused ; conidiophores erect, simple, rarely slightly 
branched, brown ; conidia in simple or branched chains ; pyriform 
with neck-like apex, dark brown, verrucose, 30-50/x x 12-18//. 
Hab. Saprophyte on Laminaria fronds, Ayrshire, Dorset, 
Orkney. 
Fig. 5 Macrosporium laminarianum (1-4), Alternaria maritima (5-7) and 
Epicoccum maritimum (8-10), 7, conidiophores of Macrosporium ; 2, conidia with 
scars of attachment ; 3, terminal cell of conidiophore, showing type of thicken¬ 
ing ; 4, renewed growth of conidiophore; 5, conidiophores of Alternaria with 
simple and branched chains ; 6, types of conidia ; 7, neck showing smooth cell; 
8, diagrammatic section showing sporodochia of Epicoccum ; 9, group of 
conidia; 70, conidia, one with pedicel, other showing point of attachment. 
While examining bleached and dried fronds of Laminaria, 
collected in the Orkneys in 1914, muriform conidia of the 
characteristic Macrosporium type were noted. These were always 
