Pliaeozoosporii.ae. Litliodermatacca', Litliodcrnia. 307 



Bemerk. Algonvog. v. Holgoland (1894), p. 237. — Thallus ni- 

 groscenti-olivaceus, crustaceus, tota inforiori pagina arcto niatrici 

 adnatus, tenuis, in formam orl)icularem tendens, novis stratis pe- 

 riodice superimpositis sonsim crassior ot firmus ; strata e filis 

 eroctis simplicibus articulatis concrotls e strato inforioro oriun- 

 dis confecta; colluhi? in superficio minutie sul^polyhodricce aut ma- 

 jores rectangulares et secus serios flabelliformiter arcuatas dispo- 

 sit^e, quibus in ambitu crescit alga. Pha^ophora lenticularia,' in 

 quaque cellula plura. Sporangia plurilocularia (gametangia Kjellm.) 

 lineari-oV)longa aut elongato-elliptica. Sporangia unilocularia in 

 filis verticalibus e transformatione cellula^ apicalis exorta (indeque in 

 crusta superficialia.) plorumquo globosa (soc. Kuckuck) aut obovata 

 (sec. Areschougy. 



Obs. Croscendi modo differt genus Litlioderma a Ralfsia, illud 

 crescit Melohesia?, hsec Lithopliylli more. Lithoderma species am- 

 plectitur aquie et dulcis et marinae incolas. 



1. Lithoderma fatlscens Aresch. Observat. phycologic» III, p. 23, 493 



Kjellm. Alg. of Arct. Sea p. 255, t. 26, f. 6-7 !, Kuck. Bemerk. Al- 

 genveg. v. Holgoland (1894), p. 238, f. 11-12, Ralfsia fatiscens 

 Gobi Algenfl. weiss. Meer. p. 74, Ralfsia extensa Crouan Fl. du 

 Finistere (1867), p. 166 (sporang. plurilocular.)?. — Crusta late 

 effusa, conspicua, supra levi, deniquo crassiore, aeri exposita in fru- 

 stula fatiscente. 



Hah. lapidibus parvis adnatum in zona sublitorali maris in 

 oceano Atlantico boreali, imprimis ad oras Norvegite, Groenlandioe, 

 Spotsbergite, maris Murmanici, Kariani, Albi (ad insulas « Solo- 

 wetzki »), Sibirici et in sinu « Baffin » (K.jellman, Areschoug, Ro- 

 SENviNGE, GoBi, T. M. FiiiEs), circa insulam Helgolandiam (Kuckuck); 

 ad oras Brasilige (Glaziou, Moebius). — In magno et rotundato la- 

 pide crusta arcto adnata, diamotro usque pedalis sod vix plus quam 

 1 mm. crassa, supra levis et in aqua subnitida adultior cum est; 

 in interiore parte pagina^ superioris cellulae superficiales fh. e. api- 

 ces filorum verticalium) videntur formare paronchyma ox cellulis 

 polyhedricis minutissimis constitutum sed in ambitu, in quo cru- 

 sta crescit, in crustis novissimis et in prolificantibus sunt celluhe 

 suporficiales fere rectangularos, secus serios ordinatse, qun3 lacinias 

 marginales cmstie pleruinque ffabelliformes intrant. H« celluhe 

 videntur juniores, ex (luarum divisione verticali fila verticalia nu- 

 mero augentur. Fila h»c sunt linearia, 12-18 u lata, 8-12-articu- 



