( 121) 
CHRYSOBLASTELLA gen. nov. 
Plants in compact tufts of medium size with branching 
stems having well-defined central strand. Leaf-lamina above 
of two layers of crowded cells, highly mammillose on both 
upper and under surface: costa with 10 or 12 guide-cells 
and large stereid bands above and below. Peristome-teeth 
16, erect, from a short basilar membrane, grooved or more 
or less divided along median line to a little above the base, 
often somewhat irregular. Older leaves in lower part golden 
orange-colored. 
This genus of Pottiaceae (Trichostomeae) is related to both 
Timmiella and Dialytrichta. ¥From the latter it may be dis- 
tinguished by the mammillose, not papillose leaf-surface, and 
the double layer of cells across leaf, while T7mm7zella has 32 
teeth in the peristome and under surface of leaf smooth. 
Chrysoblastella Boliviana sp. nov. 
Dioicous. Branching stems oe green above with 
radicles below, up to 2.5 cm. hi leaves incurved when 
dry, erect-spreading when moist, are from a broadly 
ovate base, somewhat keeled above, with margins flat: peri- 
chaetial similar to stem-leaves but with longer, loosely clasp- 
ing base; costa stout, percurrent, about 80 # wide at base; 
leaf-cells above crowded, highly mammillate, obscure, 4-6 in 
diameter, below golden-colored, rectangular, 8-10 # wide by 
30-60 » long near costa and gradually much shorter and nar- 
rower toward margin: seta about 1.5 cm. high; capsule 
erect, oblong-cylindrical, 2 mm. long with conical, obliquely 
rostrate lid one half as long; exothecal cells thin-walled, 
ing short and small but scarcely transversely elongated ; an- 
nulus of 1 or 2 rows of cells breaking away from lid in frag- 
ments; stomata 25 # long, scattered over the short collum; 
peristome of 16 erect, reddish-brown teeth, more or less di- 
vided, papillose, with few distinct articulations above, from 
a short basilar membrane of irregular cells attached close to 
the mouth; calyptra smooth, mitrate, finally splitting to above 
the middle: spores smooth, up to 16 in diameter. 
Pelichuco, 3450 meters, on earth, May 3, 1902 (2862). 
BaRBULA AMBLYACRA C. Miill. 
San Juan, Apolo-Lanca trail, 1050 meters, on rock along 
stream, March 21, 1901 (1792); near San José, 600 meters 
(1787); Tumupasa, 540 meters, January, 1902 (1710). 
