V. F, Brotherus, Musei africani. 1, 195 
Neckeraceae. 
Dusenia Broth. 
Syn. Lasia Brid. nec. Lour. 
D. incrassata Broth. n. sp.; autoica; rigida, pallide fuscescenti- 
viridis; caulis longe repens, ramosus, ramis julaceis, ad 3 cm usque 
longis, flexuosis, dense foliosis, parce ramulosis, obtusis; folia sieca arcte 
imbricata, apice reflexiuscula, humida patentia, e basi cordata late ovata, 
breviter acuminata, cuspidato-acutata, marginibus ad medium folii revo- 
lutis, superne indistinete crenulatis, nervo validiusculo, superne tenuiore, 
ad acumen evanido, cellulis oblique seriatis, valde incrassatis, rhomboideis, 
parietibus vix conspicuis, lumine anguste elliptico, laevissimis; bracteae 
perichaetii in eylindrum nitidum, longiusculum convolutae, e basi con- 
volutaceo-lanceolata in acumen elongatum protractae, nervo ad medium pro- 
ducto indistineto vel obsoleto, cellulis elongatis, pallidissimis; seta 
brevissima, vix curvula, lutea; theca emersa, cylindraceo-ovalis, ore 
angustior, rufa; peristomum D. productae; calyptra pilosa. 
Usambara: Lugulua Wald (Horst n. 2628). 
D. productae (Hornsch.) proxima, sed cellulis magis incrassatis, lumine angustiore 
nee non theca minore, angustiore distinguenda. 
Herr Prof. ExsLer hat mich gefälligst darauf aufmerksam gemacht, dass der Name 
Briper’s nicht aufrecht gehalten werden kann, da die Araceengattung Lasia Lour. älter 
ist. Ich erlaube mir daher die schöne Moosgattung dem hochverdienten Erforscher der 
westafrikanischen Moosflora Herrn P. Dus£x zu widmen. 
Hildebrandtiella C.-Müll. 
H. Holstii Broth. n. sp.: dioica; mollis, laete viridis, nitidissima; 
caulis repens, filiformis, nudus, ramis adscendentibus. flexuosis, apice 
plerumque reeurvis, teretibus, turgidis, erassiusceulis, 3—4 em altis, dense 
foliosis, gemma parvula indistincte euspidatulis, simplieibus; folia laxe 
imbricata, cochleariformia, e basi subcordata ovato-ovalia, obtusa, apiculo 
brevissimo, acuto terminata, 4,5—2 mm longa et 0,95—1,14 mm lata, 
marginibus erectis, superne incurvis, haud conniventibus, summo apice 
erectis, integerrimis, enervia, cellulis elongatis, angustissimis, basilaribus 
multo brevioribus, latioribus, aureis, alarıbus quadratis, haud incrassatis, 
aureis, omnibus laevissimis; bracteae perichaetii in cylindrum longum, 
angustum congestae, infimae parvae, ovatae, supremae elongatae, con- 
volutaceae, sensim acuminatae, integerrimae; seta unacum vaginula vix 
3 mm alta, stricta; theca erecta, cylindracea, 2 mın alta et c. 0,5 mm 
crassa, rubro-fusca, laevis; operculum e basi conica longe et oblique 
rostratum; calyptra cucullata, pallida, apice fusca, laevis. 
Usambara: Bulua Wald, 1030 m, an Baumrinde (Horst n. 4312). 
Species pulcherrima, H.pachycladae Besch. proxima, sed colore viridissimo, mollitie 
et foliorum forma facile dignoscenda. 
H. pachycelada Besch., Fl. Bryol. Reun. p. 423; Bracteae peri- 
chaetii in cylindrum longum, angustum congestae, infimae parvae, ovatae, 
13* 
