NOTES ON PENICILLUS AND RHIPOCEPHALUS 8 
P. capitatus differs in having still more slender filaments, eee 
measuring 100-200 p in n diam., and not exceeding 800 p; its s 
moreover, is thinner, terete, rigid, often sau longer, and scuba 
into the middle of the capitulam or beyo 
As regards figures 16 and 26, wh ok represent portions of 
etolum- filaments branching dichotomously, each branch ex- 
hibiting the characteristic basal constriction, it should be seniniall 
out that Dawe in Penicillus nor in Rhipocephalus is there ever 
at these constrictions or elsewhere any transverse septum. The 
plans is gine siinlar throughout. On this point Harvey was in 
In writing of P. ‘dumetosus in Néreis Boreali- Americana, 
i, (1857), p. 44, he says: “As long as these longitudinal fila- 
Hitits cohere into a stipe they are unicellular; but when they 
gated by Montagne in 1845 (Ann, Sci. Nat. xviii. pp. 262- d. ae 
he flatly denied the truth of Kiitzing’s observation (Ueber 
‘¢ Polypiers calciféeres’’ des Lamouroux, 1841, p. 11) that the fla, 
ments of the se ee are not: septate. Yet Kiitzing was right, 
and detenciedy ong. 
Passing now iw the other gonus—Rhipocephalus—we find in se 
British Mastin Herbarium a arkable and unique 
specim 
(fig. 8). It was collected on the oars of Florida by Rugel, ro 
ae by the Museum with Shuttleworth’s raae ium. It 
might at first sight be regarded as a new mt ; but after a 
careful study of numerous specimens of R. Pha sar Giant half a 
dozen herbaria, we are convinced that Rugel’s slant must be referred 
to this species, though much exceeding normal specimens in length 
of stem and flabella. R. Pheniz is a most variable species in shape 
and size. In normal specimens the terete calcified stem varies in 
length from 30 to 90 mm. The upper part seen 20-40 mm.) is 
arabe: by the capitulum, the component flabella of which are 
ut 5-20 mm. long. The capitulum varies mil § in conte being 
rom: oblong, obese’, or irregular, The flabella are usually ascend. 
me; and ma y be long or short. Each flabellum is a  ealeifién; mono 
stromatic, cuneate lamina, composed of a number of filaments closely 
coherent side by side, and arising from a single ‘basal filament by 
repeated dichotomies. The diameter of the filaments is 75-100 p 
The length of the fiabella varies greatly in different plants, sat 
produces marked differences of external = ern It is possible 
to trace a series of forms passing from the type to two opposite ex- 
tremes, in one of which the flabella are so abait (5-10 mm.), ascending, 
closely imbricated into a sort of cone of overlapping vo x collars ; 
in the other extreme the flabella are long (upwards of 20 mm.), 
, variously and deeply jncieital sede exert, perhaps, in 
youth) united into trim, perfoliate co sage co 
kempt appearance. To the former of t peti Ade we give the 
name brevifolia, and to the latter rather hie we are unable 
regard them as more than mere forms grading insensibly into the 
ype. 
ae : B2 
