30 
THE SEAWEEDS 
Family ULOTRICHIACEAE. 
Filamentous Forms. 
Reinbold detected a microscopic green alga in plants of Coeloclonium 
and Halodictyon from Lacepede Bay, which he referred to Entocladia 
viridis Reinke, a member of the Ulotrichiacieae. Reinbold gives no details. 
De Toni gives in his Sylloge Algarum the species as Endoderma viride 
Reinke (Sub Entocladia). His description is: — Filaments subdendritic 
branching; vegetative cells 3 p to 8 ^ thick, varying in length, mostly 1-6 
times the length of the diameter, subcylindrical, often contorted or 
ventricose. 
Most Ulotrichiaceae are fresh-water forms, but Endoderma viride occurs 
as an endophyte in the Mediterranean and on the coast of the Netherlands. 
APJOHNIA Harvey. 
There is but one species known, the characters of which therefore are 
the characters of the genus. These are given by Harvey as follows:— 
h rond stipitate, dendroid. Stipes rooting, unicellular and monosiphonous, 
transversely rugulose, thinly coated with calcareous matter, at maturity 
crowned with a pencil of branches. Branches confervoid, umbellate, 
polychotomous, fastigiate, free, articnlated ; articulations clavate, annu- 
lated at base, and filled with bright green watery endochrome. Named in 
honour of Professor Apjohn of Dublin, and of Mrs. Apjohn, a zealous 
phycologist. 
Apjohnia laetevvrens Harvey. 
An attractive tree-shaped plant reaching a height of about 15 cm. It grows 
erect from a small bunched attachment composed of unicellular fibrils, has 
a distinct stem and repeatedly divided branches. The branches and 
branchlets come off mostly in threes, in an umbellate manner. The naked 
stem consists of a single club-shaped cell, which is an inch or two long, 
tapering to the base, and for its lower half is constricted into a succession 
of rings. Between the points of division each branch and branchlet also 
consists of a single cylindrical or club-shaped cell and each is similarly 
constricted into rings at its base. The endochrome is of a vivid green, 
but thin and watery, giving a glossy, lucent appearance to the frond. Adult 
plants may become thinly coated with carbonate of lime and thus rendered 
opaque. 
The species grows on the steep sides of rock pools, near low- water mark; 
it occurs freely on the shores of South Australia and Victoria, and rarely 
in Tasmania. 
Unfortunately nothing is known of the means of reproduction. Super- 
ficially the plant bears resemblance to a Cladophora, but by its method of 
