Scyloneiiui\ xvu. scYTONEMACEiE (West). 371 



The following may be a larger form of this species : — 

 GoLUNGO Alto. — Filaments forming somewhat irregular penioillate 



tufts of a brown colour. Crass, fil. 23-25 ji ; crass, trich. 14'5-17 /x. 



The specimens were not in a condition for satisfactory identification. 



Ad fontem prope Banza de Bango, socialis cum Anthocero, etc. ; 



Sept. 1855. No. 158. 



4. S. Millei Born, in Born, et Thur. Notes Algolog. 147 (1880) ; 

 Born et Plah., I.e., 93 (1887); W. et G. S. West in Journ. Bot. 

 1897, p. 265. 



Heterocysts sometimes subquadrate. 



PuNGO Anuongo. — Ad rupes vulc. humectatas prope Oacella ips. 

 PrEesidii, inter Dichotrichera oUvaceam ; Feb. 1857. No. 7. 



5. S. ambiguum Kutz. Spec. Algar. 894 (1849) ; Tab. Phyc. ii. 

 (1850-2), 7, t. 26, f. ii. ; Born, et Flab., I.e., 100 (1887) ; W. et 

 G. S. West in Journ. Bot. 1897, p. 265. 



PUNGO AxDoxciO. — Inter S. Myochrous var. chorograpliicum ; Feb. 

 1857. No. 6. 



The heterocysts are about three times longer than broad, and 

 sometimes as many as three together. 



6. S. figuratum Ag. Syst. Algar. 38 (1824) ; Born. etFlah., I.e., 

 101-3 (1887) ; W. et G. S. We.st, I.e. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 LopoUo ; May 1860. No. 15. In graminosis paludibusjuxtarivulum 

 de LopoUo ; April 1860. No. 180. 



7. S. Myochrous Ag. Dispos. Algar. Suec. 38 (1812) ; Born, et 

 Flak, I.e., 104-6 (1887). 



Conferva Myochrous Dillw. Brit. Conferv. 37, t. 19 (1802). 



Var. chorographicum W. et G. S. West in Journ. Bot. 1897, 

 p. 265. 



PuNGO Andoxgo. — Freq. et temp. pluv. (Dec. usque Apr.) Isete 

 vegetans, in summis rupibus Prsesidii ; Feb. 1857. No. 6. Alga 

 erecta vel decumbens, caespitose crescens, filamentis oculo nudo nigris, 

 penicillatim e centro adh. radiantibus, mox latas rupium gigant. 

 plagas, imprimis verticales, colore atro tingens, qua ex causa = Pedras 

 negras de Pungo Andongo. 



Etiam ad latera boreal, et ocoid. de Pedra Songue ; April 1857. No. 

 12. Alga terrestris vel potius rupestris, eximie gregaria, increment! 

 rapidissimi, juventute et tempore per dies nebuloso atrovirens, solis 

 luce et nidore cito nigrescens, latissimas rupium plagas perpendlculares 

 colore aterrimo tingens. 



This agrees in every particular with S. Myochrous, with the exception 

 that the filaments are never ocreate. From S. figuratum it differs in 

 being of larger dimensions, and in having a relatively thicker sheath. 



8. S. insigne W. et G. S. West in Journ. Bot. 1897, p. 266. 

 GoLUNGO Alto. — Ad rupes madidas in umbrosis juxta rivum 



Coango inter Sange et Undelle, nunc violaceo-viridis, nunc intensius 

 violacea ; May 1856. No. 5. Etiam ad rupes rivul. Coango humect, 

 pulvinula livido-cinerea spongiosa formans ; June 1856. No. 140. 

 This plant is noticeable for the variability of its filaments, some 



