Myxophycese, Heterocystidese, Nostoc. 899 



(Wollny); prope Smichow Bohemia^ et Tergestuin Istriiu (Han- 

 sgirg). 



17. Nostoc margaritaceum avuetz.) Rab. Fl. Eur. Alg. II, p. 169, 956 

 Hormosiphon margaritaceus Kuetz. Sp. Alg. p. 301, Briigg. Biindn. 

 Alg. p. 262. — Strato geliueo, difformi, luteo-fuscesceuti; tricho- 

 rnatibus inrequicrassis, leviter curvatis, subparallelis : articulis 

 oblongis vel ellipticis, 2, 2-8, -5 [j.. diam., utroque polo subacutis, 

 laxe connexis, subdistantibus homogeneis, pallide a^rugincis; hete- 

 rocystis oblongo-sphairicis, hyalinis, ceteris cellulis paulo majo- 

 ribus, ad 4,5 ji diam. ; vaginis sat amplis, 7,2-13 [i. crassis, fusce- 

 scentibus, homogeneis, margine saepius deliquescentibus. 



Hah. in saxis inter muscos nec non in ericetis et arcis hor- 

 toruni post pluvias, imprimis in locis montuosis Galliae (Lenormand), 

 SaxonicB (Rabenhorst), Helveti;e (Bruegger). — Var. moniliforme 

 Wittr. Om Gotlands och Oelands Sotvattensalger p. 68: heterocystis 

 ellipsoideo-globosis, 2-3-plo crassioribus; articulis 2,5 {x. diam. ; 

 vaginis submouiliformibus 6-7 «x. crassis. Ad « Slite Enholmen » 

 Gotlandi;^ (Wittrogk). 



18. Nostoc gelatinosum Schousboe in Bornet Deuxieme note sur les 957 

 gonidies de Lichens, in Ann. des sc. nat, 5 ser. Bot., 1874, XIX, 



p. 318, Born. et Thur. Not. alg. II, p. 93, t. XXVII, f. 12-14, Born. 

 Alg. de Schousb. p. 27, 1. 187, Born. et Flah. Rev. IV, p. 199, Nostoc 

 Delpini Borzi Morf. e Biol. in N. G. B. It. Vol. X, p. 281, t. 8, f. 1-3. 

 — Thallo gelatinoso, irregulariter expanso, buUato-tubercuIato, ma- 

 gnitudinis fructus Olea? et ultra, fuscescente; filis flexuosis, laxe im- 

 plicatis; vaginis exterioribus distinctis, luteo-fuscis, laxis, interio- 

 ribus hyalinis confluentibus; trichomatibus 4 [i. crassis, confor- 

 mibus ; heterocystis ellipticis. 5 [i. latis, 6-10 jx. longis; sporis ob- 

 longis, 6-8 ;x. crassis, 8-14 [x. longis, apicibus truncatis levibus, 

 episporio minute granuloso-aspero, pallide fuscescente. 



Hab. ad rupes montis Djebel-Kibir dicti, circa Tingin, in stilli- 

 cidiis (ScHOUSBOEi; in Apennino Etrusco pr. Vallumbrosam (BoRzi). 



19. Nostoc Passerinianum (De Not.) Bornet et Thuret Not. Algol. II, 958 

 p. 99, 1880, Born. et Flah. Rev. IV, p. 199, Hansg. Prodr. II, 



p. 60, Anabcena Passeriniana De Not. in Erb. critt. it. n. 1339!, 

 in Hedwigia 1866, V, p. 108, Rab. Fl. Eur. alg. IH, p. 422, Borzi 

 Morf. etc. in N. G. B. it. 1878, X, p. 286. — Thallo crustaceo- 

 expanso, orbiculari, gelatinoso-membranaceo, pagina inferiori ad- 

 nato, luride oliv;iceo vel fusro, papuloso, 1-2 centim. lato; filis 

 dense approximatis, verticaliter flexuoso-implicatis, paralielis; tri- 



