Riccia] hepatics (Stephani). 311 



HuiLLA. — Glaucescent-green ; widely caespitose on rocks in the ele- 

 vated parts of Serra de Oiahoia near Humpata ; May 1860. No. 255. 



2. RICCIELLA A. Br. in Flora od. Bot. Zeit. p. 756 (1821). 



1. R. abnormis Staph, in Hedwigia xxx. p. 213 (1891). 

 PuNGo AxDOXGo. — Gregarious in caverns of the more elevated 



rocks on Pedra de Cazella within the prsesidium, April 1857 ; in rocky 

 places by the river of Pungo Andongo ; March 1857. No. 229. 



GoLUNGO Alto. — A fleshy, glauco-papulose, very fragile little plant. 

 On the muddy rocks of the Carenghe rivulet of AltaQueta; April 1850. 

 No. 309a. On moist ground by the rivulet of Quarengue in Queta : 

 Feb. 1850. No. 309b. 



2. R. RautaneniiSteph. in BuIl.Herb. Boissier,III. p. 374 (1895). 

 Mcs.SAMEDES. — Rather common in the littoral region of the plain 



of Mossamedes ; in muddy-sandy places by the banks of the river 

 Bero (or Rio das Mortes) near Cavalheiros ; with fr. July 185'* 

 No. 257. 



3. R. Welwitschii Steph. sp. n. 



Dioicous. Plant rather large, flavous-green, stellately ex- 

 panded or substratified. Frond up to 6 mm. long, oblongo- 

 obeuneate, shortly furcate at apex, with the forks short divergent, 

 deeply bilobed ; thin, narrowly reticulate owing to the appearance 

 of the lamellae in transmitted light ; costa very small, a few cells 

 in depth, about one-third the width of the frond, the wings in 

 consequence very much exceeding the width of the costa ; margins 

 very thin, containing very shallow cavities ; stratum of air- 

 cavities shallow, with the lamellae almost horizontal. Spoi-es 42/>(,, 

 not reticulately lamellate, rough all over with very crowded short 

 spines. 



LiBOXGO. — The only Hepatic till then found or observed in the 

 littoral region by Welwitsch. Frond bright-green (not glaucous), 

 stellately expanded, close pressed to the ground. On the shaded 

 moist-sandy banks of the river Lifune above Banza de Libongo (in 

 the Arimo de Sr. Freire) ; with fr Sept. 1858. No. 260. 



3. CYATHODIUM Kunze in Lehm. et Lindenb. Pugill. Plant, 

 vi. p. 17 (1834). 



1. C. cavernarum Kunze, I.e., p. 18. 



Pungo Axdongo. — Covering the rocks by the rivulet of Mutollo 

 with wide, grass-green, cushion-like patches, the fronds overlapping 

 like scales ; Jan. 1857. No. 226. A glaucous-green, velvety Hepatic, 

 flabellately expanded on moist ground, on rocks near Cabondo within 

 the praBsidium ; Feb. 1857. No. 238. 



GoLUNGo Alto. — A plant of very thin spongy texture, in the 

 living state of a very bright green colour and stellately expanded on 

 the rocks, but in the dry state completely collapsing ; at the cataracts 

 of the spring called Quibolo, Monte de Queta, March 1856. No. 312. 

 Thallus glaucous-green very thin ; on rocks by the Capopa spring ; Jan. 

 185G. No. 317. Growing on the ground and moist rocks, with the 

 frond closely adpressed, very thin, glaucous-green, velvety, but unfor- 

 tunately in the dry state soon turning yellow and collapsing ; common 

 on rocks by the cataracts of Capopa near Sange ; Jan.. Feb. and July 



