the Genus Streptopogon . 14 1 
the leaf, especially in the dry state, has a distinctly spathulate 
outline. That this form is not separable systematically, 
is clearly shown by the fact that on the stems in question 
leaves of the more usual form, i. e. wider and less concave, 
occur lower down the stem, especially at the places where 
branching takes place. I have also seen on other stems, 
e. g. in the specimens in Spruce, 4 Muse. Amazon, et And., 
nr. 140 ’ (in Herb. Kew), leaves clearly intermediate in shape 
between these two extremes. 
The stem seen in transverse section is composed of one or 
two peripheral rows of thick-walled cells enclosing a tissue 
formed of rather large cells with very thin and often flexuose 
walls ; there is no 4 central-strand ’ differentiated. The leaf- 
nerve is composed of two ‘ pointer-cells ’ and a strongly convex 
dorsal band of stereid-cells ; 4 companion-cells ’ are absent 
(see Fig. 68). 
I have followed Brotherus ( 3 ) in placing the present species 
in the section Calymperella of the genus. In order to do this 
a slight emendation of the characters of that section becomes 
necessary (see above, p. 114). Muller (21 and 24 ) defined 
his sections as follows : 4 Calymperella, C. Mull. Blatter mit 
anomaler, aus der vorgeschobenen, halsartig verlangerten 
Rippe gebildeten Blattspitze, welche sich in Puccinia-artige 
Korper auflost 1 ; and 4 Eustreptopogon, C. Mull. Blatter mit 
normaler Spitze ; Rippe auslaufend, oder in eine mehr oder 
weniger lange Granne austretend.’ Muller, probably without 
seeing specimens, placed the present species in the sect. 
Eustreptopogon, but it seems clear that its proper position 
is in Calymperella with 5 . rigidus, to which species it 
shows affinity in leaf-areolation and in the production of 
gemmae. 
S, clavipes, Spruce (Figs. 28-37, 7 2 j 73)- 
S. erythrodontus (Tayl.), Wils., var. clavipes, Spruce, Cat. Muse. 
Amazon, et And. 3 (nomen) (1867). 
A. clavipes, Spruce ex Mitt., Muse, austr.-amer., 178 (1869) ; Jaeger, 
Adumbr. i, 255 (1873) ; Paris, Index bryolog. in Actes Soc. Linn. 
Bordeaux, li, 275 (1897) ; C. Mull., Gen. Muse. Frond., 421, 423 
