PALMELLACES, 9 
Genus 4. UROCOCCUS. Hass. (1845.) 
Cells large, globose, or oblong, reddish or blood-red; tegu- 
ment thick, gelatinous, concentrically lamellose; stem thick, 
gelatinous, often ringed or annulate. 
All the species in this genus are rare, and with one exception confined 
to Britain. We are, therefore, compelled to reproduce figures already 
published, without measurements or information beyond the original 
descriptions. 
The peculiar structure of the pedicellate cells is thus described by 
Braun :—“ The large globular brownish-red or blood-red cells throw off 
colourless layers of cell membrane, which appear to be separated by 
intermediate layers of softer jelly, whence arises a distinctly concentric 
structure of the envelope. But the enveloping layers of Urococcus do 
not retain their original form and integrity ; not increasing themselves 
in size, they are pushed off on the upper side by constantly succeeding 
inner coats, being at first merely attenuated at one side, but subse- 
quently, as it seemed to me, actually broken through. Since this emer- 
gence from the old coats is always repeated on the same side, a mem- 
branonus-gelatinous peduncle is produced formed of cups fitted one into 
another, so as to give an annularly streaked, apparently shortly articu- 
lated aspect. The red cell, which occupies the summit of this peduncle, 
sometimes divides, and this of course produces a subsequent dichotomy 
of the peduncle. If the periods of the formation of the separate 
enveloping layers were known, the age of the little plant, whose 
history is preserved in the gelatinous peduncle, might be determined by 
the number of rings.’’—Rejuvenescence, p. 179. 
* Stem annulate. 
Urococcus Hookerianus. Hass. Alg.t. 80,f. 4. 
Cells globose, or elliptic, variable in size, blood-red, granular, 
stem more or less elongated, often divided, densely ringed. 
Size, Cells -013--U6 mm. (Labdh.). 
Rabh, Alg. iii. 31. 
Hematococcus Hookeriana, Berk, & Hass. in Hass. Alg. p. 
325, t. 80, f. 4. 
On chalk cliff, &e. 
Plate IV. fig. 1. a, cells considerably magnified, after Hassall; 0, 
cells further magnified, after Rabenhorst. 
Urococcus insignis. Hass. Aly. t. 80, 7.6, a. b. 
Cells large, globose, blood-red; stem abbreviated, remotely 
annulated. 
Rabh. Alg. iii. p. 31. 
Hematococcus insignis, Hass. Alg. p. 824. 
“This very fine species I have never met with in any considerable 
quantity. Scattered isolated globules I have frequently met with, and 
these occasionally attached to a closely corrugated or. ringed mucous 
appendage. Each globule is usually surrounded by a single vesicle or 
ring; in some globules, however, there are as many as four or five en- 
closing vesicles.” — Hassall. 
Plate IV. fig.2. a, 6, cells considerably magnified, after Hassall. 
c 
