137 
the Genus Streptopogon . 
The peristome of 5 . Lindigii has a very interesting and 
characteristic structure, not found elsewhere in the genus. It 
may be noted here that Muller and many authors describe 
the peristome- teeth of Barbala (including Syntrichid) as thirty- 
two in number, while Schimper, although giving this number 
in the c Bryologia Europaea,’ describes them in the £ Synopsis * 
as being sixteen in number, ‘ in crura 32 divisi.’ Brotherus 
also, in giving the characters of the family Pottiaceae , in which 
the genus Streptopogon is placed, says : 
* Zahne 16, einer niedrigen oder hoheren, zuweilen rohrenformigen, 
schrag gewiirfelten Basilarmembran aufsitzend, entweder flach, unge- 
teilt, durch enge Spalten durchbrochen, oft bis zur Basis in 2 (3) 
lineare und paarweise genaherte, meist ungleiche Schenkel geteilt, 
oder die Basilarmembran in 32 gleichweit gestellte, fast stielrunde, 
fadenformige, aufrechte oder schrage, allermeist spiralig links 
gedrehte Peristomaste gespalten, die sich nach der Anlage auf 16 
P.-zahne zuriickfuhren lassen/ 
The peristome of 3 . Lindigii is certainly, I think, to be 
regarded as being composed of sixteen filiform teeth, each of 
which is regularly split into two filiform divisions in its lower 
third, rather than of thirty-two teeth uniting above into sixteen. 
It affords a very interesting example of a transitional stage. 
As in 3 . erythrodontus , there is at the mouth of the capsule 
a * false annulus,’ formed of a few rows of exothecial cells 
which suddenly become smaller and thicker-walled. 
It is worthy of note that the operculum on being removed 
from a nearly mature capsule frequently carries away with it, 
attached to its apex, the exserted part of the columella ; so 
that an approach is made towards those species, e. g. Pottia 
Heimii (Hedw.), Bry. eur., Desmatodon sy sty tins , Bry. eur., in 
which the columella is permanently and regularly attached to 
the operculum. 
S. cavifolius, Mitt. (Figs. 67-71). 
S. cavifolius , Mitt, in Spruce, Cat. Muse. Amazon, et And., 3 (1867) 
(nomen) ; Spruce, Muse. Amazon, et And., nr. 140 ; Mitt., Muse, austr.- 
amer., 180 (1869); Jaeger, Adumbr., i, 255 (1873); Paris, Index 
bryolog. in Actes Soc. Linn. Bordeaux, li, 275 (1897) ; C. Mull., Gen. 
