162 



quelques Nostochinees. (Memoires de la Soc. imper. des sc. nat. de 

 Cherbourg. Tome V. Aout, 1857. 3) Fischer, Beitrage zur Kennt- 

 niss der Nostochaceen. Bern. 1853. 4) Hicks on gonidia of Lichens 

 (Quart. Journ. of microsc Science. 1861. N. II. p. 90.). 5) De Bary, 

 Beitrag zur Kenntniss der Nostocaceen. (Begensb. Flora. 1863.). 

 Distribuo in duas subfamilias: 



1. Nostoceae, sporis destitutae. 



2. Spermo sireae, sporis instructae. 



Subfaniilia I. Nostoceae. 



Thallus gelatinosus, varie coloratus . aut globosus v. subglobosus 

 aut foliaceo-membranaceus, irregulariter expansus , saepe bullatus, tre- 

 mulus, peridermate cinctus. Trichomata moniliformia , flexuoso-curvata 

 et implicata, nonnunquam vaginata, e cellulis vegetativis (articulis) glo- 

 bosis vel oblongis leptodermaticis , plerumque cytioplasmate granuloso 

 pallide aerugineo repletis composita, aut medio aut utroque fine cellula 

 singula perdurante pachydermatica , exacte sphaerica , rarius oblonga, 

 homogenea, non colorata hyalina instructa, sporis destituta. 



Plantae terrestres, bryopbilae vel aquaticae. 



ILXXV. Nostoc Vaucher (1803). 

 Genus unicum cum charactere Subfamiliae. 



Trichomata geiatina involvente liberata sese movent fere ad Oscil- 

 lariarum morem. 



Cavendum, ne Collematis status juveniles pro Nostoc quodam habeantur. 



a. Thallus globosus vel subglobosus. 

 t Trichomata plus minusve distincte vaginata. (Hormosiphon Ktz. e parte). 



N. minutissimum Ktz. (Phycol. gener. p. 204. N. 1. Actien 1836!). 

 N. minimum, globosum, diam. ad ^/V", durum, peridermate fuscescente, 

 adhaerens; trichomatibus tenuissimis, densissime flexuoso -intricatis, 

 saturate aerugineis ; articulis globosis confertis ; vaginis indistinctis ; cel- 

 lulis perdurantibus articulorum diametro subduplo majoribus. v. v. 



Diam. articul. 7*500— »/«,00*" = 0,00003—0,00004". 



N. confluens Ktz. (Tabul. II. p. 1. N, 548. T. I. F. III.). N. 

 antecedenti admodum simile, sed thalli confluentes, periderma non colo- 

 ratum aetate provecta diffluens , trichomata minus dense intricata et 

 cellulae perdurantes articulorum diametro duplo majores sunt. 



Hab. in locis paludosis montium Germaniae. Prope Ceivimontium 

 Silesiae detexit beat. de Flotow. 



