586 STEGOCARPI. ACROCARPI.  TRICHOSTOMUM. 
Pl. mascula gracilior subsimplex, folis late ovato- 
lanceolatis, internis brevioribus obsoletinervibus. — Tr. 
Barbulae proximum. 
98. Tr. fragile C. Müll; dense cespitosum erectum 
strictum, aequaliter e basi usque ad apicem foliosum, to- 
mentosum fragile; folia caulina erecto - appressa , flexuosa 
rigida fragilia, madefacta erecto- patentia, lineari -lan- 
ceolata acuminata erecta, nervo carinato laevi subconti- 
nuo tenui flavido, integerrima, basi longa elongate pellu- 
cide areolata et margine subundulata, supra basin cellu- 
lis basilaribus pellucidis marginata, minutissime hexagono - 
areolata et papillosa; perichaetialia basi longissima tener- 
rime elongate reticulata; theca in pedunculo elongato ri- 
gido fragili purpureo erecta cylindrica robusta, columella 
filiformi exserta. 
Didymodon fragilis Hook. in Drumm. Musc. Americ. No. 127. 
Patria. America septentrionalis ad margin. lacuum 
alpin. legit Drummond, sed rarissime, fertile. Terre 
Neuve: La Pylaie primus legit, sed sterile. e 
Species primo intuitu distinctissima et notis cursive“ 
impressis, prime fragilitate maxima, facile distinguitur. 
29. Tr. cylindricum C. Müll.; late et laxe cespito- 
‘sum amoene luteo- viride valde crispulum parum inflexum, 
plus minus humile, depressum fastigiate ramosum, molle; 
folia caulina erecto - patentia subflexuoso-recurva, an- 
guste lineari - acuminata, nervo excurrente acutiuscula, 
margine papilis subcrenulata flexuosa haud revoluta, € 
cellulis basi laxis pellucidis elongatis superne minutis te- 
nuissime papillosis opacis areolata, carinata; perichaetia- 
lia basi magis vaginante longius pellucida praedita, valde 
acuminata; theca in.pedunculo longiusculo flavido sub- 
stricto erecta anguste cylindrica longiuscula, pallida dein 
fuscescens, annulata, operculo conico-subulato obliquo; 
perist. dentes Tr. rubelli, sen saepius bifidi v. cribrosi. 
Didymodon cylindricus Br. Europ. Fasc, 29—30, p. 5. t. 3. — 
D. tenuirostris Wils. in Lond, Journ. of bot. 1841. p. 376. — Wei- 
sia cylindrica Bruch in Br. Germ, JL 2. p. 58. t. 29. — Brid. L 
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