498 Howe: PHYCOLOGICAL STUDIES 
Utricles of subcortical Subturbinate, obconical, cor- Bullate, varying from broadly 
e : n i 
ucopiaeform, or clavate, funnelform to subglobose, 
5-llo# in ‘maximum mostly ventricose-obovoid, 
width, often scarcely larger I10-215 in maximum 
than the peripheral utricles, width, always much larger 
than the peripheral utricles. 
Nodal filaments of the Fusing in twos or threes, often Fusing in twos, rarely in 
central strand. somewhat coherent just threes, not coherent, the 
above the points of fusion. fusion often incomplete. 
In addition to the differences mentioned above, the utricles of 
the subcortical layer form a more compact flat-topped stratum in 
H. discoidea than in H. Tuna, as will be seen by comparing FIGURE 
II with FiGuRE I. It should be mentioned that in drying the large 
utricles of the subcortex of H. discoidea commonly collapse and 
are flattened against the medulla and often revive imperfectly on 
being soaked out ; this is especially true of specimens which have 
been long in herbaria and it doubtless explains why this striking 
peculiarity has not received earlier recognition. 
In the firm and extensive contact of the peripheral utricles, 
Hlalimeda discoidea bears some resemblance to Halimeda cuneata 
Hering, originally described from Natal Bay, but otherwise the two 
have little in common. We have not seen Hering’s original speci- 
men, but have examined a plant from Natal agreeing in every respect 
with his description. In this, the peripheral utricles measure 27- 
44 in diameter, surface view, and show no evidence of fusion ; 
they are 60-110 long, are in close contact distally for 1-3? their 
Jength, are obconical or clavate, surmounted in a somewhat capi- 
tate fashion by the coherent distal parts, which appear subquadrate 
in a radio-vertical section. The utricles of the subcortical layer 
are only 27-55 # in maximum diameter, scarcely larger than those 
of the peripheral stratum, are 2-4 times dichotomous (2. é., in 2-4 
series), and obconical, ovoid-turbinate, or clavate. The nodal fila- 
ments of the central strand fuse in twos and threes and are strongly 
coherent just above the points of fusion, as well described by Mrs. 
Gepp (4. ¢. 1 5-17). Branches given off from the filaments near the 
points of fusion form a compact narrow annular cushion above 
which the filaments are naked and subtorulose, This annular 
nodal cushion we have observed in no other species. The seg- 
ments of //. cuneata are cuneate-obdeltoid and are almost without 
