SUPPLEMENT. 
131 
type. Branches usually secund, in some cases opposite or alternate, springing from the 
middle of the articulation (or internode), or from near its base (not from the shoulder), 
long and filiform, flexuous, furnished with several distant, secund, filiform, patent, 
secondary branches, which are either simple, or furnished with a few similar, secund 
ramuli. All the branches and ramuli of every grade spring from the middle of the 
internodes of the branches of the preceding grade. The ramuli taper to their summit ; 
the last six or eight internodes are very short, or rather are gradually developed whilst 
the ramulus lengthens, and their nodes are beset, especially those of the younger ones, 
with whorls of minute and very delicate byssoid ramelli, which seem to be connected 
with the growing process ; but perhaps may also accompany fructification, as they do 
in the nearly allied C. thyrsoideum. The articulations are cylindrical, 4-5 times as 
long as broad, with a wide, hyaline margin and dissepiment, and are filled with rosy 
endochrome. Substance membranaceous and delicate. The frond closely adheres to 
paper in drying. 
I have compared Mr. Ashmead’s specimens with an authentic one of Agardh’s 
Griffithsia tenuis from the Mediterranean, and find them to agree in every essential 
character ; the only difference that I can perceive being, that the American specimens 
are larger and more luxuriant than the European. The fructification has not been 
observed either in America or Europe, and I may therefore be accused of indiscretion 
in removing this species from Griffithsia to the present genus. I do so because its 
affinity with C. thyrsoideum of Ceylon and Australia is so great that they cannot be 
placed in separate genera ; and the fruit of the latter is known. I only question 
whether I ought not to go a step further, and unite C. thyrsoideum to C. tenue as a 
mere variety. Both are remarkable for the manner in which the branches and ramuli 
are inserted ; and may be known by this character alone from all allied species. But 
there is no American species to which the present is nearly allied. 
Page 247, under Pikea californica, add to the specific diagnosis, 
(Tab. XLIX. B.) 
And insert the following reference to the figure, 
Plate XLIX. B. Fig. 1 . Pikea californica , a robust specimen ; and jig. 2, a more 
slender and smaller individual ; both of the natural size. Fig. 3. Longitudinal 
section of the frond, showing the central, articulated axial filament, and the two strata 
of cells. Fig. 4, a transverse section of the frond ; these two figures equally magnified. 
