42 
New Marine Fungi on Pelvetia. 
septa. This undoubtedly parasitic stage would correspond to Macro- 
sporium pelvetice nov. sp. Later the ascigerous fruits of Pleospora 
appear on the same spots and on identical mycelium. This would 
seem to make the Imperfect fungus the conidial stage of the 
Pyrenomycete. But culture experiments are necessary to make 
this point certain although this type of conidium is common to 
other species of Pleospora. 
The perithecia are large and at first sunk in the thallus, but 
finally become superficial. Paraphyses are present in the immature 
fruits, but later they break down and deliquesce. 
In conclusion I wish to express my thanks and indebtedness 
to Mr. A. D. Cotton, who noted Mycosphcerella previously, and 
kindly handed over to me his material collected at Blakeney and 
Clare Island, and also to Mr. L. A. Boodle, by whose courtesy 
this work was carried out in the Jodrell Laboratory. 
University College, 
Southampton, 
December, 1914. 
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