302 PERCY SLADEN TRUST EXPEDITION 
CryPTonemta, J. Ag. 
1. CRYPTONEMIA SEMINERVIS (Ag.), J. Ag. 
J. Agardh, Algee Liebman. p. 11 in not. 
De Toni, Syll. Alg. vol. iv. sect. 1v. 1905, p. 1610. 
Saya de Malha, 55 fms.; dry specimens. 
Amirante ; dry specimen. 
Distribution. Mediterranean; Atlantic ; Red Sea. 
in a dry condition the plants appear to have no midrib, but ou moistening a delicate 
midrib became distinctly visible, and this extended upwards to about the middle of the 
leaf. The plants are barren. 
2. CRYPTONEMIA spec. 
Saya de Malha, 55 fms.; dry specimen. 
A poor fragment, but differing from Cryptonemia seminervis by its much thicker frond 
and dark red colour. 
Fam. SQUAMARIACE A. 
Tt is much to be regretted that so many of the specimens of Squamariaceze collected 
by Mr. J. Stanley Gardiner are sterile, for without fruit it is almost impossible to name 
the genera and species of this puzzling family. I happened to have studied a large 
collection of Indian Peyssonnelie before I undertook to name the present collection, and 
this has helped me to recognize some of the species mentioned hereafter. 
In my “ List of the ‘ Siboga’ Algze” I will treat in detail of the Peyssonnelie, and only 
mention here that I have found it of great help to keep up a distinction already hinted at 
by the late Dr. F. Schmitz*, namely, the distinction based on the differences in arrange- 
ment of the filaments of the hypothallus. These horizontal filaments, which run over 
the substratum, give off the ascending vertical filaments of the perithallus, and Schmitz 
observed that some hypothalli consisted of straight filaments running close to one 
another (Peyssonnelia), and that others consisted of curved fan-shaped groups of filaments, 
as in the basal layer of Cruoriella. Tio these two subgenera, if I may distinguish them 
provisionally by such a name, I wish to add a third, differing in having no hypothallus 
proper, but a mesothallus, 7. e., a layer of cells occupying the middle of the thallus (as is 
the case, for instance, in Ralfsia expansa), which gives off branches both downward and 
upward. My investigations do not yet allow me to decide whether this division of the 
genus Peyssonnelia, based as it is upon anatomical characters, is supported by differences 
in the structure of the fruit. Sometimes this is the case, but my specimens are mostly 
barren. 
For this third subgenus I should like to propose the name of Héhelia, in honour of my 
dear friend, Mrs. E. 8. Gepp. 
* Schmitz, ‘‘ Marine Florideen von Deutsch Ost-Afrika,” in Engler’s Bot. Jahrbuch, Bd. xxi. Heft 1, 2, 1895, 
p. 173. 
