499  STEGOCARPI. PLEUROCARPI. Hypnum. 
357. M. conspissatum Hook. et Wils. (Loud. Journ. 
of bot. 1844. p. 553.); caulis elongatus fluitans ramosus; 
ramis plus minus longis fastigiatim dispositis sordide vi- 
ridibus, apice subincurvis, rigidis robustis; folia caulina 
densiuscule imbricata, plus minus falcato - secunda, rigida, 
crassiuscula opaca, carinato - concava, anguste ovato- 
lanceolata, nervo crasso excedente pungentia, limbo cras- 
sissimo tenerrime papilloso circumducta, integerrima, cel- 
lulis opacis maxime pachydermibus subrotundatis, sordide 
viridissimis, alaribus vix conspicuis incrassatis. 
Cum ic. in Fl. Antarct. II. p. 419. t. 155. f. 3. 
Patria. Insulae Kerguelen et Falklandi, locis palu- 
dosis vel in aquis ipsis fluitans: J. D. Hooker, Lyall. 
E distinctissimis, sterile tantum observatum, M. flu- 
viatilis formis robustis proximum. Cinclidodontibus ha- 
bitu haud dissimile, 
B. Nervi evanescentes. 
358. H. commutatum Hdw. (Musc. Fr. IV. p. 68. 
t. 26.); dioicum; cespites lati molles sordide virides fer- 
ruginei; caulis procumbens assurgens, ramulis gracilibus 
maxime secundifoliis simplicibus apice recurvis densis- 
sime approximatis apicem versus sensim brevioribus valde 
pinnatus, filis conferviformibus basi latioribus parce di- 
visis obtectus; folia caulina laxe imbricata late hastato- 
lanceolata breviter acuminata falcata, superne tenuiter 
serrulata, firma, leviter plicata, carinata laevia margine 
Subinvolutaceo, nervo valido ultra medium evanido luteo, 
cellulis minutis incrassatis luteo-viridibus pachydermibus 
subdiaphanis , alaribus majoribus paucis incrassatis fusci- 
dulis v. pellucidis; perich. valde exserta appressa stricta; 
late lanceolata plicata subintegerrima, multo pallidiora, 
laxius reticulata, nervo latissimo ante apicem evanido; 
theca in ped. crasso purpureo flexuoso laevi geniculato= 
ascendente subhorizontalis , e basi turgida arcuato- cylin- 
dracea, badia, operc. conico acuto, annulo angusto; perist. 
robusti d. int. in membr. alta flavida angusti hiantes, Ci- 
lis 1 —2 brevioribus albidis. 
