TAB. VI. 
Anemia (Anemidictyon) Tweedieana, Hook . 
Humilis, frondibus glaberrimis pinnatis, pinnis 3-7 subro- 
tundo-ovalibus obtusis dentatis reticulatim venosis tenui- 
costatis, terminali inaequilaterali, spicis compositis bipinnatis 
una cum pedunculis fronde brevioribus, stipitibus basi squa- 
mosis rachique decidue fusco-yillosis. 
Hab. Tucuman and Uraguay, S. Brazil, Tweedie . 
This is one of the few Anemias distinguished by the reticu- 
lated (not forked) veins, of which Mr. John Smith has consti- 
tuted the genus Anemidictyon , and in which he has been 
followed by Presl. We feel it safer, in the present state of 
the science, at least, to consider it rather a section of, than a 
distinct genus from, Anemia ; for there is no natural character 
to distinguish it, nor any other mark beyond the mere anas- 
tomosing of the veins. As in Anemia proper, the species of 
this section are exceedingly variable. Presl enumerates 12, 
which he divides into groups, the one having the terminal lobe 
of the frond coadunate with the nearest lateral ones, and then 
lobed or cut, and the other into those which have the terminal 
lobe free. Among the former he places the A. Phyllitidis of J. 
Smith in Hook. Gen. Fil. which he considers identical with 
A. fraxinifolia of Raddi, Fil. Bras. t. 8. bis. Smith’s plant, 
however, is represented with a free terminal lobe, and it be- 
comes a question whether it be distinct from the A. Phyllitidis 
of Swartz, nor can we point out any character of our present 
species, other than the smaller size, the few very obtuse pinnae 
to each frond, together with their freedom from all pubescence, 
combined with the short peduncule and spikes. 
Fig. 1 . Pinnule, f. 2. Lobes of the spikes, f. 3. Capsule: 
— magnified. 
