New and Interesting South African Mosses. 
181 
DiCEANACBAB. 
Trematodon intermedins Welw. & Duby. Moorddrif t, Waterberg District, 
Transvaal, 1915 ; coll. H. A. W. (No. 411), c. fr. 
According to Eoth (' Aussereuropaischen Laubm.,' i, 258), this species 
has the neck of the capsule from 1|^ to 2ce the length of the sporangium. 
In the original specimens from Angola, however, at the British Museum, I 
find the neck only about equal to the capsule or a shade longer, except where 
the over-mature capsule has widened and shortened, when the neck is 
appreciably longer, but not much so. In all respects Wager's specimens 
agree with this plant, hitherto only recorded from tropical Africa. 
Trematodon pallidens C. M. Woodbush, Transvaal; coll. H. A. W. 
(No. 273), c. fr. Sent to me for description as " Trem. transvaaliensis 
"Wag. & Broth., n. sp., Broth. MS. in litt." I cannot separate it, however, in 
any way from T. 'pallidens. The teeth are not particularly pale, but that is 
not a character insisted on in the description of the original plant. It 
agrees in all other respects. The leaf margin is frequently or usually very 
narrowly recurved above — a character which, I think, being unusual in the 
genus, goes far to confirm the identification with T. pallidens. 
JDitrichum, strictum (H. f. & Wils.) Hampe (sjn, D. australe [H. f. &W.] 
Mitt.). Giant's Castle, 8000 ft., Natal, 1915 ; coll. R. E. Symons, comm. Sim 
(No. 8537a). For the distribution of this species, new to S. Africa, see 
note below on Aongstroemia julacea. 
Ditriehum amoenum Thw. & Mitt. Kaapsche Hoop, 1915 ; coll. H. A. W. 
(Nos. 302, 330); Oeorge, CP., 1916; coll. H. A. W. (Nos. 514, 565) ; near 
Hogsback, 4-6000 ft., Tjumie, CP., coll. Hend. (No. 212) ; all c. fr. 
These all agree with the Indian plant, which differs from B. flexifolium 
(Hook.) solely in having the peristome very short and rudimentary. Since 
D. amoenum is found only in collocation with D . Jlexifolium, in India and 
South Africa, and since the two agree in every other respect, I think there 
can be little doubt that this plant is but a variety of D. flexifolium with 
depauperate peristome. 
Ditriehum spirale Dixon sp. nov. (PI. XI, fig. 1.) 
D.flexicauli (Schleich.) afiine. Dioicum. Kobustum, elatum ; ad 7 cm. 
altum, superne olivaceum, inferne castaneum ; caules dense coespitosi, 
radiculosi, flexuosi, hie illic divisi. Folia ad 5 mm. longa, suberecta vel 
leniter homomalla, siccitate haud crispata, suhula autem in se longe regidariter 
spiraliter torquata; e basi subvaginante cito in subulam duplo longiorem 
angustissime loriformem, sat rohustam opacajn attenuata, apicem versus hie 
illic dentihus perpaucis argutis praedita. Cellulae basilares elongatae, lineares, 
marginales angustissimae, tenuissimae, hyalinae, supra sensim breviores, ellip- 
ticae, subula minutae, breviter rectangulares, perobscurae. Costa ad basin 
lata, male definita, supra maximam partem subulae occupans. Cetera ignota. 
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