512 Myxophycese, Soytonemacese, Scytonema. 



Hah. in rupibus « Little Falls, N. J. » A.mer. bor. (Austin) et 

 passini in Pennsylvania (Wolle). 



30. Scytonema ampluni W. et G. S. West in Journ. Linn. Soc. XXX, 

 p. 370, t. XVr, f. 14-16. — Strato parvo, pannoso, 3-5 inm. lato, 

 fusco; filis dense intricatis, 19-24 [x. diani., pseudo-ramis sparsis, 

 plerunique geminatis sed interdum singulis, 13,5-16 [i. diam., filo 

 primario tenuioribus; vaginis amplissimis, stratis parallelis formatis, 

 peripberice gelineo-achrois vel subluteolis, in parte interna abrupte 

 luteo-fuscis; trichomatibus angustis, 3,5-4 [j.. diam. luteo-viridibus, 

 apicem pseudo-ramulorum versus crassioribus et articulis brevio- 

 ribus; articulis diametro 3 '/3-6-plo (plerumque 4-plo) longioribus ; 

 heterocystis oblongis, diametro 3-3 '/^-plo (rarius 2-plo) longioribus. 



Hab. socia Symploca cuspidata W. et W. in cacuminibus montis 

 « Trois Pitons » Dominicas ( Elligtt). 



31. Scytonema tenuissimum Schmidle Epiph. Alg. aus N. Guin., in 

 Flora 1897, p. 323. — Strato Hgno vel foliis adnato, irregulariter 

 maculiformi, caeruleo, rarius coeruleo-viridi vel viridi, parum ele- 

 vato; filamentis fere parallelis, parum nitentihus, subtilibus, 5-6 [i. 

 crassis, parce ramosis; raniis singulis, filamento primario orthogo- 

 niis; vaginis tenuibus, hyalinis, in superficie externa calcaria sen- 

 sim exasperatis; trichomatibus 3-4 [x. crassis, {^erugineo-viridibus, 

 dissepimentis aegre conspicuis; articulis plerumque ad 8 [i. longis 

 vel subquadratis; heterocystis raris, luteis, quadratis, angulis ro- 

 tundatis vel rotundis, diametro longitudine subaequalibus vel se- 

 squilongioribus. 



Hah. in foliis vel in ligno, hyphis funginis sa^pe consociata 

 Papuasi.p in Pithophora clavifera Schmidle (Lauterbach). 



32. Scytonema varium Kuetz. Sp. k\g. p. 307, 1849, Tab. Phyc. 11, 

 p. 6, t. 23, f. 11, Rab. Fl. Eur. Alg. 11, p. 279, Zanard. Phyc. 

 Indic. Pug. in Mem. del R. Istit. Ven. XVII, p. 29, Kurz Algae 

 coll. in Arrac. p. 182, M. et Schr. Ess. p. 34 (non Crouan), Scyto- 

 nema chrysochlorum Kuetz. Sp. Alg. p. 305, 1849, Tab. Phyc. II, 

 p. 6, t. 19 f. II, Wolle Freshw. Alg. of U. S. p. 253, Kirchn. AI- 

 genfl. V. Schles. p. 226, non Rab. — Strato tomentoso, 2-3 mm. alto, 

 cyaneo-viridi vel fusco; filis tortuosis, intricatis, 9-15 [Ji. crassis, 

 virescentibus aut luteolis; vaginis gelatinosis, inferne hyalinis, pel- 

 lucidis, superne lutescentibus ; trichomatibus 5-7 [jl. crassis, ccru- 

 gineis aut luteis; articulis subquadratis, dense granulosis, vix di- 

 stinctis; heterocystis subquadratis vel diam. longioribus, achro- 

 maticis. 



