V. F, Brotherus, Musei africani. II, 241 
brevem, strictum vel longiorem, flexuosum, subintegrum producto, cellulis 
omnibus linearibus, valde sinuosis, basilaribus ad marginem haud sinuosis, 
laxis, subquadratis, aureis. Caetera ignota. 
Kamerun: an Baumzweigen oberhalb Buea c. 2425 m (Dustn n. 296) 
und an Steinen in Bächen c. 2700 m (Junaner n. 415). 
Species Gr. heterostichae (Hedw.) proxima, sed foliis cellulis usque ad apicem 
linearibus nec non alaribus laxis, subquadratis dignoscenda. 
Zygodon Hook. Tayl. 
Z. Volkensii Broth. n. sp.; synoicus; robustus, viridis; caulis 
ad 3 cm usque altus, erectus, tomento ferrugineo obtectus, innovando ra- 
mosus, ramis fastigiatis, laxe foliosis; folia sicca erecta, flexuosa, humida 
squarrosa, breviter decurrentia, lineari-lanceolata, mucronata, marginibus 
erectis, apice argute serratis, nervo breviter excedente, dorso laevi, cellulis 
hexagono-rotundatis, minute papillosis, basilaribus lutescentibus, elongatis, 
laevibus; seta 45—17 mm alta, tenuis, flava; theca erecta, longicolla, 
subeylindraceo-elliptica; sicca sulcata, microstoma, pallida, aetate fus- 
cescens. Caetera ignota. 
Kilimandscharo: Wäldchen am Kifinika Krater 2800 m (Vorkrws 
n. 1896). 
Species Z. Reinwardtii (Hornsch.) valde affinis, sed foliis squarrosis, lineari-lanceo- 
latis dignoscenda. 
Macromitrium Brid. 
M. (Leiostoma) rugifolium C.-Müll. n. sp. in sched.; dioicum; 
caespitosum, caespitibus densis, latissime extensis, rigidis, ochraceis, 
nitore destitutis; caulis longe repens, vage ramosus, ramis repentibus, 
dense ramulosis, ramulis erectis, simplicibus vel dichotome ramulosis, 
dense foliosis, obtusis; folia ramulina sicca horride crispula, humida 
valde patula, carinato-concava, valde rugosa, brevia, lanceolata, breviter 
acuminata, marginibus basi uno latere paulum revolutis, apice inaequaliter 
serrulatis, nervo rufescente, paulum infra apicem evanido vel brevissime 
excedente, laevi, cellulis minutissimis, rotundatis, sublaevibus, basilaribus 
elongatis, lumine angustissimo, tuberculoso-papillosis, infimis uno latere 
ad nervum laxis, hyalinis, calymperoideis; bracteae perichaetii foliis 
subsimiles, intimae haud rugosae, subintegrae, cellulis laevibus; seta 
1,5 cm alta, superne sicca dextrorsum spiraliter torta, rubra, laevis; theca 
erecta, globoso-ovata, laevis, infima basi tantum indistincte plicata; oper- 
culum? calyptra fusca, nuda. 
Kamerun: an Bäumen oberhalb Buea 2425 m (Dustn n. 263). 
Species M. Menziesii Mitt, et M. undatifolio C.-Müll. affinis, sed rigiditate, foliis 
brevioribus, horride patulis, valde rugosis, apice argutius serrulatis discernenda. 
M. (Leiostoma) Dusenii C.-Müll. n. sp. in sched.; caespitosum, 
caespitibus humilibus, densis, late extensis, sordide fusco-viridibus, nitore 
Botanische Jahrbücher. XXIV. Bd. 16 
