HoweE: PHYCOLOGICAL STUDIES 511 
stood and it is probable that the name has been applied to more 
than one thing, but, in any event, it has, as a rule, a considerably 
thicker, less gelatinous thallus than H. actinophysa, and is less 
nitent when dry. Inacystocarpic specimen from Florida in herb. 
Agardh, communicated by Mrs. Floretta C. Curtiss, the medullary 
filaments are 8—13u in diameter and have dense granular contents, 
the subcortical layer consists of 1-3 series of ovoid or subglobose 
densely granular cells, mostly somewhat flattened in the plane of 
the thallus; conspicuously capitate endings for the medullary fila- 
ments are scarcely found, though the subcortical cells anastomose 
and are sometimes inconspicuously 3-6-radiate; it should be said, 
however, that there are frequent large ganglioid or irregularly 
stellate cells or filaments which have more homogeneous contents, 
and whose branches make their way freely among the ordinary 
vegetative filaments; these we take to be the sporogenous fila- 
ments. But in thicker, more gelatinous plants that have been 
referred to H. floridana, with more vacuous, more flexuous, and 
commonly a little larger medullary filaments (such, for example, as 
Phyc. Bor.-Am. 7492, b, and c), one often finds stellate vegetative 
ganglia in the medulla and finds also the medullary filaments 
terminating in the subcortex in a subglobose radiately branched 
cell, but this rarely exceeds 30u in diameter and its branches very 
rarely, if ever, exceed six in number. 
Of Halymenia ulvoidea Zan. and H. coccinea Ardiss. we have 
been able to examine no authentic specimens, but H. ulvoidea is 
described and figured as having a dentate-ciliate margin and H. 
coccinea, which De-Toni hints may be Callymenia Requieni, is 
said to have a lamina only 1-2 cm. wide. 
Halymenia actinophysa is in some respects rather suggestive of 
Aeodes nitidissima J. Ag., an apparently original cystocarpic speci- 
men of which, collected by Berggren at Tauranga, New Zealand, 
and sent out by J. Agardh, we have been able to examine through 
the courtesy of Professor Farlow. But H. actinophysa is a thinner, 
softer, more gelatinous plant (the thallus of Aeodes nitidissima is 
about 240p thick) and is quite different in vegetative structure. In 
Aeodes nitidissima the medullary filaments on reaching the sub- 
cortex send out usually 3 branches in a somewhat verticillate 
manner, but there is very rarely any tendency toa capitate enlarge- 
