230 



trichomatibus tcnuissimis , erectis , strictis , dilute aerugineis , distincte 

 articulatis, arctissime vaginatis ; fibris fasciculatis basi amethysteo-fusces- 

 centibus , trichomatum longitudinem aequantibus. 



Diam. trich. l /im"' = 0,000088", libraT. V^ooo'" = 0,00003". 



Hab. in fontibus lapides occupans, prope Falaise (De Brebisson). 



A. amoena Ktz. (Phycol. gener. p. 220. N. 1. Tabul. I. T. 79.). 

 A. caespitosa, saturate aeruginea ; trichomatibus validis liberis, aequali- 

 bus, laete aerugineis, passim interruptis, brevissime articulatis ; articulis 

 diametro triplo quadruplove brevioribus , subtiliter granulosis ; vaginis 

 arctissimis, achrois, superne plerumque inanibus, homogeneis ; fibris bre- 

 vissimis, dilute viridibus, dense fasciculatis, inarticulatis. v. s. 



Diam. trich. c. v. i /m— t fii8 Hi = 0,00025—0,00028". 



Hab. in locis inundatis: prope Nordhausen (Kiitzing), in ripis 

 Danubii ad Viennam Austricam (A. Grunow). 



A. villosa Ktz. (1. c). A. caespitoso-fioccosa, saturate viridis, 

 fuscescens ; trichomatibus erectis , dense aggregatis, indistincte articu- 

 latis , in apicem byalinuni longissime protractis ; vaginis arctissimis 

 achrois, vix visibilibus; fibris abbreviatis, tenuissimis, basi fuscescenti- 

 bus, sursum achrois. v. v. 



Diam. trich. V^oo— Vsoo'" = 0,00022—0,00029". 



Hab. in saxis superfusis in rivulis regionis montanae et subalpinae. 



IilV. Artlirotillllll Rabenh. (1864): Trichomata flagel- 

 liformia, distincte articulata, vaginata, erecta, aut parallela aut sub- 

 radiantia, basi cellula perdurante instructa, fibris articulatis erectis 

 dense circumvallata , in stratum crustaceum vel membranaceum inde- 

 finite expansum collocata. 



Conf. Fig. nostr. 54. (sub Amphithrice). 



A. papillosum ( Amphithrix papillosa Rabenh. Krypt. Flor. von 

 Sachs. I. p. 105.). A. thallo membranaceo firmo, papilloso, sordide 

 olivaceo - viridi vel fuscescente , opaco ; trichomatibus subuliformibus, 

 dilute aerugineis , erectis , parallelis , substrictis ; articulis homogeneis, 

 diametro triplo quadruplove brevioribus ; vaginis luteolis hyalinis arctis ; 

 fibris subsetiformibus, basi distincte articulatis, trichomatum longitudine 

 subduplo brevioribus. 



Diam. trich. c. v. l / 3 oo— l jm'" = 0,00029—0,000318". 



Hab. in lapidibus lignisque aqua balneorum superfusis, prope „Bad 

 Elster " in Saxonia. 



A. rude (Menegh.) Rabenh. (Rivularia rudis Menegh. Nostoch. 

 p. 140. T. XV. F. 2, Amphithrix rudis Ktz. 1. c). A. crustaceum, 



