the Genus Streptopogon. 143 
cuspidato-aristatis, paraphysibus filiformibus articulis superioribus 
subinflatis antheridia superantibus. 
Hah. — America australis. Ecuador — Andes Quitenses: Palla- 
tanga, 6,000 ped., c. fr. (Spruce, nr. 141 d) ! ; Loxa (Loja), on branches, 
c. fr. et pi. masc. (G. Massee, 1870), nr. 14 (sub S. Massed \ Mitt. mss. 
in Herb. Mitt.) ! 
The present species was first published by Spruce ( 29 ) 
in 1867 as a variety of A. erythrodontus (Wils.), but was after- 
wards given specific rank in Mitten’s ‘ Musci austro-americani ’ 
in 1 869. The only locality hitherto recorded for the plant has 
been Pallatanga in the Andes of Quito, where it was origin- 
ally discovered by Spruce, and distributed by him under the 
number 141 d (not 1418 as is given in ‘Muse, austr.-amer.’) 
in his ‘ Musci Amazonici et Andini.’ Although A. clavipes 
is very similar in habit and vegetative characters to S', ery- 
throdontus ^ a close comparison of the two species shows the 
existence of several important differences. In the first place 
the capsule of S', clavipes is immersed or emergent, never 
exserted as in S. erythrodontus ; the membrane of the tubular 
base of the peristome is not ‘ tessellated,’ and the free teeth 
of the peristome are not at all twisted in the moist state, 
and in the dry state less so than those of S. erythrodontus ; 
the exothecial cells are collenchymatous ; the cells of the 
operculum are not spirally arranged, but form straight rows ; 
and the calyptra is setulose from about the middle to the 
extreme base, the hairs being longer than those of A. erythro- 
dontus. In vegetative characters there is much less difference 
between the two species ; the shape of the leaf is the same, 
but the upper areolation of A. clavipes as a rule differs in the 
cells being narrower and more regularly hexagonal, — the cells 
often being arranged in a seriate manner (Fig. 36). It is to 
be noted, however, that occasionally the cells are quite irregu- 
larly arranged, and of the same shape as those of .S', erythro- 
dontus (Fig. 73). The limb is 3-4 cells wide in the lower 
part of the leaf, and, in all the specimens I have examined, 
is continued to the extreme apex, although becoming in the 
upper part of the leaf very narrow and reduced to one or two 
