310 BRYOPHYTA OF S. RHODESIA. 



Cellulae basilares quadrato-rectangulares, pellucidae, superi- 

 ores parvae, 5/a ad 8/x, irregularis, subrotundae, obscurae, mamil- 

 losae, parietibus tenuibus, pellucidis, subcollenchymaticis. 



Seta 5 mm. ad 7 mm. longa, rubra; theca pctrva, elliptica. 

 1 mm. longa, pachydermia, castanea, gymnostoma (?), operculum 

 hand visum. 



Habitat: Dry area, Victoria Falls (Sim, 8931). 



A very pretty and distinct little moss in the broad, rounded 

 leaves scarcely or not at all altered when dry, as well as in other 

 characters. (,'. tnosis (Lor.) somewhat resembles it, but has 

 markedly longer and narrower leaves. 



Hymenostylium crassinervium Broth, and Dixon in Smithson. 

 Miscell. Colls., 69, No. 2, p. 13.— Victoria Falls, alt. 3,000 feet 

 (Sim, 8899, 8902) St. 



The basal cells are a little laxer than in the type, but other- 

 wise it agrees quite well. 



Trichostomum cyatJiiforme sp. nov. Dixon. 



Sat robustum, atro-viride, inferne atratum. Caules circa 

 1 cm. alt i , caespitem densum, rigidiusculum efficientes. Folia 

 superne dense comata, sicca fortiter circinato-incurva, valde con- 

 voluta, dorso pallida, brevia, 2 mm. ad 3 mm. longa, o basi brev: 

 plerumque latiore, mepe suborbiculari, usque ad 1 mm. lata, 

 in laminam duplo longiorem, late oblong o-ovatam vel subspatJiu- 

 latum, eoncavam, c gat Ji if or men continuata, obtusa, rotundata, vel 

 ob margines superne fortiter late involutas eueullata. Costa 

 pervalida fusca, haud pellucida, dorso promineus, laevis. 



Cellulae laminae 8jtx ad 10/x latae, hexagonae, perchlorophyl- 

 losae, opaoae, ob parietes firmas vix incrassatas pallidas dictinctae, 

 supra plerumque sublaeves vel dorso irregulariter prominentes, 

 inferne (supra basin) saepius, praecipue paginae ventralis, valde 

 papillosae, saepe papilla singula alt a apice bifida coronatae. Cellu- 

 lae basilares omnes tenerae, pcrln/aliiuie, elongatae, lineares vel rect- 

 angulares, juxtacostales saepius breviores latioresque, omnes in eas 

 laminae abrupt e transeuntes nisi marginales, seriebus 2 ad 3 

 hyalinae elongatae ultius aseendentes, ibidemque margine saepa 

 leniter denticulato. Cetera ignota. 



Habitat: Victoria Falls, alt, 3,000 feet (Sim, 8934). 



The generic position of this plant cannot be certainly ascer- 

 tained without fruit; it might conceivably be a Hyophila, or, of 

 course, a Totella. It is recognisable at once by the leaf characters, 

 the deeply concave, boat-shaped lamina with the clearly differen- 

 tiated base of elongate, hyaline or pellucid, thin-walled cells, pass- 

 ing abruptly into the small, opaque upper ones, except at the 

 margin, where a row or two of the basal cells ascend for some 

 little distance upwards. The lamina occasionally on pressure 

 flattetis out entirely, and in that case the leaf base may be little 

 or not wider, but as a rule the base is much broader, short and 

 suborbicular, rapidly narrowed into the concave, cyathiform upper 

 part. 



