340 ENUMERATIO ACANTHACEARUM 



through being weathered, which always has a very delicate 

 diaphanous hyaline border, so delicate that rarely any cellular 

 structure is to be observed ; this I find a very constant character, 

 and is to be noted in all the stages of growth of the leaves : this 

 character, along with the entire absence of any approach to 

 crenulation, at once separates it from obtusum. Prof. Lindberg 

 mentions that obtusum is found in many places in Scandinavia ; 

 so Dr. Spruce writes me that it may turn out to be the commonest 



species in these islands. 



Nees von Esenbeck, in his 'Natural History of the European 

 Hepaticas' (1836), vol. ii., page 52, describes a species Jxmtjermannia 

 gymnomitrioides, which is admitted into the ' Synopsis Hepaticarum,' 

 Gottsche, Lindenberg & Nees (1844), page 107; but in the Supple- 

 ment, on the authority of Gottsche, is referred to the male plant of 



Gymnomitrium concinnatum. 



From our present knowledge of the distinctions between obtusum 

 and concinnatu m we might be led to think, from Nees' description, 

 that he had the former in view. The point could at once be 

 settled by the examination of the original specimens from the 

 Herbarium of Nees, but most probably Prof. Lindberg fully 

 satisfied himself of their distinctness before creating the new 

 species obtusion. 



ENUMERATIO ACANTHACEARUM HERBARH 



WELWITSCHIANI ANGOLENSIS. 



Auctore S. Le M. Moore. 



(Continued from p. 314.) 



§ Gendarussa. 



Justicia Salsola (sp. nov. ) — Divaricata, ramosissima, caule ob- 

 scure tetragono primo pubescente et (sicco) pallide viridi mox 

 glabro nodosulo valido cortice albido spongioso copiose obducto 

 et reliquias ramorum evanidorum ferente, foliis crebris linearibus 

 obtusis coriaceis mox glabris floribus axillaribus solitariis fere 

 omnino sessilibus, bracteis linearibus quam calyx paullo brevioribus, 

 calycis laciniis 5 subaequalibus linearibus acutis pubescentibus, 

 corolhe extus pubescentis tubo fere uniformi limbi labio postico 

 2-fido lobis omnibus ovatis, filamentis crassiusculis basi glabns 

 antherarum bculis subaequalibus inferiore eximie calcarato, stylo 

 capitellato, capsula oblonga compressa apice acutata obscure 

 puberula 2-sperrua, seminibus hand visis. 



Hab. In collinis aridis maritimis ad Praia da Amelia. (No. 5023.) 



Caulis basi vix 4-0 cm., crassus. Folia 1-1*5 cm. long, vix 

 2*0 cm. lat., superiora vero minora sicca pallide viridia subtus 

 obscure 1-nervia. Flores parvi brevissime pedunculati. Bracteae 

 calycisque laciniae 0*5 cm. long. Capsula 0-6 cm. long. 



Cum J. patula, Lichst. et prassertim J. orchioidi, L. fil compar- 

 anda, sed habitu equidem multo minus rigido, bracteis diyersis, 

 floribus minoribus, calyce pubescente ab ambabus faciliter dignos- 

 cenda. A J. martioidi, T. And. et J. spermdifolia, T. And. speciminibus 



