41 
the outer layers of the assimilating cells till they reach the larger 
and more isodiametrical elements of the collecting and storage 
tissue which do not, of course, contain any coloured plastids. The 
filaments of the endophyte are little branched except at the two 
ends. They branch near to the surface of the host for the formation 
of the sporangia, and again among the deeper cells deep in the tissue 
of the host, presumably for the absorption of food. I did not 
observe any intracellular connection between the cells of the two 
organisms. But that is, of course, not necessary for an exchange 
of dissolved material. The separate cells are short and squat. 
Their diameter measures about -009 to -Oil mm. As a rule the 
cells are broader than long. I have been unable to make out clearly 
the shape of the plastid. Monosporangia are formed near the 
surface of the host plant. As is generally the case, new spores are 
formed in the old sporangia as soon as one spore has been shed. 
The sporangia are about -015 mm. long. 
The following is a brief diagnosis of the new species : Thallus 
endophyticus, filis instructus totaliter immersis, intercellularibus, 
apicibus utrisque solis ramosis ; cellular lata) •009- , 011 mm. 
rotundatro aut medio inflatas, rarius elongata), pilis longis rarissiine 
instruct® ; chromatophorum non bene visum ; sporangia quasi 
emersa, -Oil mm. lata et ad -015 mm. longa, monospora. Habitat 
in fronde fertili Himanthaliu) lore®, St. Mary's Island, Northumber- 
land. 
0 
