20 ARKIV FOR BOTANIK. BAND 10. w:o 2. 
Helechos de Juan Fernandez 34—? A. capense Johow, |]. 
c. 34. 
Juan Fernandez: Masatierra, Valle Colonial, 22. 8. 1908. 
The two leaves collected are somewhat different in gen- 
eral habit, but are certainly forms of the same species. The one, 
which is sterile, has a short, compact lamina with triangular- 
ovate, shortly acuminate pinnz and pinnules, which are so 
closely placed, that they covers each another; the other leaf, 
which is fertile, has an open lamina with pinne at distances 
of 5—6 cm.; pinnules distant, narrow obcuneate, i. e. from 
a broader base very gradually attenuated in an acuminate 
apex. This latter form resembles very much some forms of 
the variable P. adiantiforme (Forst.) J. Sm. (Aspidium ca- 
pense Willd.), and I am very inclined to believe this form being 
the same Jonow named A. capense. I have compared the 
two specimens with numerous samples of P. adiantiforme 
from various countries and find, that P. Berterianum can be 
distinguished from all forms of P. adiantiforme by 1) the 
scales of the rhizome, which are narrow-acuminate, of a deep 
redbrown colour or almost black, hard and thick, while in 
P. adiantiforme the scales are broadly ovate, yellowish brown, 
very thin; 2) the rather densely scaly under surface, 3) the 
exactly opposite pinne and 4) the distinctly decurrent pin- 
nules. Further I find in both specimens a peculiar charac- 
ter, which seems to be unknown within the genus Polystichum, 
namely the presence on both surfaces of numerous, somewhat 
irregularly shaped, rather flat, a little shining, brown drops 
of gum. By microscopical analysis the gum is found to be 
a secrete from very small, capitate, unicellular glands, which 
are partly immersed between the cells of the epidermis. I 
have examined a long series of species of Polystichum, but 
in all the surfaces of the lamina were found to be quite with- 
out glands. 
Pteris Berteroana Agardh, Rec. Gen. Pteridis 66. 1839. 
Syn. P. comans Johow, Helechos Juan Fernandez 25. 
Juan Fernandez: Masatierra, P:to Ingles, by stream 
in the valley. — Masafuera, in Quebrada de las Casas (new 
for this island). 
