296 PROF. OLIVER ON NEW PLANTS FROM RORAIMA. 



(271*.) Selaginella (§ Heterostachys) rhodostachya, n. sp. ; caule decuinbente, ramis 

 alternis cleltoideis flabellato-bipinnatis, foliis heteroniorphis disticbis menibranaceis, 

 planse inferioris laxe dispositis erecto-patentibus ovatis obtusis paulo insequilater- 

 alibus, planse superioris consimilibus duplo miuoribus valde ascendentibus, spicis 

 brevissimis platystachyoideis, bracteis diinorphis ovatis acutis membranaceis. 

 Belongs to tbe group Proniflora? in tbe neighbourhood of S. consimilis and Otonis. 



The stems are half a foot in length, and the leafy branches ^ in. broad. This was 



contained in the collection without any number. 



MUSCI. By Mr. W. Mitten, A.L.S. 



Hookeria (§ Omaeiadelphtjs) crispa, C. Mull. Bot. Zeit. 1855, p. 768. Perfectly fruited, 



near encampment, no. 123. 

 Hypopterygium Tamarisci, Brid. ; Hyjmum Tamarisci, Sw. ; Hedw. Muse. Frond, t. 51. 



Without fruit. Near encampment, no. 265. 



Polytrichum aristiflorum, Mitt. Journ. Linn. Soc, Bot. vol. xii. p. 620. A few 

 barren stems, near encampment, no. 116. 



Creeping over the roots of this are a few stems of Jungermannia perfoliata, Swartz, 

 or of one of the closely allied South-American species of the little group to which Mr. 

 Spruce has applied the name Syzygiella in the ' Journal of Botany,' 1876, intending it 

 to include Jungermannia perfoliata, J. contigua, and J. concreta, Gottsche, J. plagio- 

 chiloides and J. pectiniformis, Spruce, also J. macrocalyx, Mont. ; to these must be added 

 J. geminifolia, Mitt., Journ. Linn. Soc, Bot. vol. vii. p. 161, from tropical Africa, and the 

 J. submtegerrima, Reinw. Bl. et Ne'es, Hep. Jav. in the ' Synopsis Hepaticorum,' placed in 

 Plagioehila (p. 55). To this species belong P. variegata, Lindenb., P. variabilis, Lacoste, 

 and also P. secwrifolia, Lindenb. Sp. Hep. t. x., all of which have the leaf-angles united on 

 both sides of the stem, even when they are not opposite, a characteristic which is not 

 mentioned in their original descriptions, or depicted in their figures, nor in that of the 

 J. macrocalyx as found in the ' Synopsis.' The perianth in J. submtegerrima agrees with 

 that found in the species allied to J. colorata, and, as in their case, is subtended by 

 shortened and dentate involucral leaves. Exactly similar instances of conjugation of 

 the leaf-angles are found in Plagiochila, some of which do not otherwise resemble 

 each other. 



Plagiochila adiantoides, Lindenb. Male stems only, upper slope, no. 283. 



Aneura bipinnata, Nees {Jungermannia, Sw.). Specimens taken from large tufts, upper 



slopes, nos. 201, 284. 



In these specimens the stems are 4-5 cm. high, including the side branches 1 cm. wide, 



the ultimate ramuli with a limb of about two rows of more pellucid cells ; in A.fucoides, 



Hook. Muse. Exot. t. 85, this limb is very much wider; in A. Poeppigiana it is nearly or 



