Brachythecium coruscum n. Sp. 
Dioicum. Planta mascula tantum cognita. 
Cæspites laxi, decumbentes, intus decolorati, superne luteo- 
virides — lutei, sericeo-nitentes. 
Surculus ad 7 cm. longus, ca. 1.25 mm. crassus, apice sub- 
regularis — curvulus — breviter hamatus, ramos vagos vel unila- 
teraliter subpinnatos breviores vel longiores emittens, radicellis desti- 
tutus vel fasciculis fuscarum lævium parcissime præditus. 
Caulis 0.28 mm. crassus, demum fusco-viridis, sectione angu- 
lato-rotundatus, ob folia decurrentia aliger, fasciculo centrali ca. 
0.03 mm. crasso, cellulis perpaucis composito, reti ceteroquin pæne 
a centro usque sensim crassiore, intus areolas fere hexagonas præ- 
bente, stratis periphericis 3 substereideis, superficiali turgido. 
Folia caulina densa, imbricata, subsecunda, ad longitudinem 
0.25 mm. decurrentia, ex ovato — late ovato sensim in cuspidem 
longiusculam pro more falcatam angustata, 2.4 mm. longa, 0.76—1 
mm. lata, plicis compluribus profundis irregularibus exarata, mar- 
gine toto utroque inæqualiter, inferne late, superne anguste reflexa, 
integerrima, ultimo apice tantum interdum indistincte emarginata; 
rete densum, chlorophyllo pæne destitutum, nonnisi ad infimam 
basim porosum; cellulæ basilares indistincte incrassatæ, mediahæ 
subrectangulæ, 0.047 — 0.06 mm. longæ, 0.008 mm. latæ, angulares 
in spatio triangulo bene definito quadratæ — breviter rectangulæ, 
0.013 mm. latæ, haud crassiores; cellulæ folii medii et superioris 
lineares, vix flexuosæ, parum crassæ, 0.075 mm. longæ, 0.0075 
mm. latæ; costa basi ca. 0.05 mm. lata, sensim attenuata, longe 
infra cuspidem dissoluta, flexuosa, dorso prominens, stratis 3—4 
cellularum uniformium composita. 
