422 Phoeoizoosporinse, Chordariaceae, Leathesia. 



exteriore curvaturae latere infra apicem serie ramuloruni unilate- 

 raliter plumulata; inferiores ramulorum superioi-ibus paulo longio- 

 res, omnos brevissimi, unico articulo fere constituti, expansione 

 unilaterali articuli generantis initio saltem formati. Plumula hrec 

 minutissima gelatina indivisa s«pe cohibetur. Sporangia unilocula- 

 ria cuneato-obovata, majuscula, dimidium filum longitudine saepius 

 ipquantia, nunc superantia, filis multo crassiora. 



LEATHESIA Gray [1821] Brit. Pl. I, p. 801 (Etym. a G. R. Leathes 

 cui genus dicatum), J. Ag. Sp. I, p. 50, Till Algcrn. System. IV, p. 40. 

 Dc Toni Syst. Uebers Fucoid. 1891, p. 178, Kjellm. Handbok I, 

 p. 38, Engl. & Prantl Natiirl. Pflanzenfam. 86. Lief. p. 228, Conj- 

 nephora Ag. [1824] Syst. p. XIX, Clavatclla Bory [1823] Dict. class. 

 III, p. 470, Chcetophora% Rividariw, Tremella', Ulvce, Nostocis sp. 

 auct. veter. — Frons parva, centrifuge crescens, primitus globosa et 

 solida, demum irregulariter lobata et cava, gelatinoso-carnosa; axis 

 abbreviatus e cellulis oblongis in fila a puncto centrali radiantia de- 

 composito-furcata conjunctis constitutus; fila peripherica e cellulis 

 extremis minoribus egredientia, muco involuta, simplicia, clavata, 

 brevia, moniliformi-articulata. Sporangia unilocularia ellipsoidea 

 aut piriformia, ad basin filorum periphericorum evoluta; sporan- 

 gia plurilocularia uniseriatim locellata, filiformia, ad basin filorum 

 periphericorum evoluta. 



1. Leathesia difFormis (L.) Aresch. Phyc. scand. p. 376, Kjcllm. Hand- f,93 

 bok I, p. 38, f. 8 h-c, Kuck. Bemerk. iib. Algenveg. von Helgoland 

 1894, pag. 248, Tremella di/formis L. FI. suec. p. 429, Nostoc 

 ma^Hnum Ag. Disp. p. 45, Nostoc mesentericum Ag. Syst. p. 21, 

 Corynephora marina Ag. Syst. p. 24, Clavatella Nostoc Bory I.c, 

 Cha^tophora marina Lyngb. Hydrophyt. Dan. pag. 193, tab. 66.1 

 (pessima (luoad analysin), Bivularia tuherifonnis Engl. I5ot. tab. 

 1956, Leathesia tuheriformis Gray Arrang. Brit. pl. vol. I, p. 301, 

 Harv. Phyc. Brit. t. 324, Johnst. & Croall Brit. Sea Weeds III, 

 p. 117, f. 1-4 (pessima), Leathesia marina J. Ag. Sp. I, p. 52, 

 Kuetz. Sp. p. 543, Ulva mesenterica Bonnem. sec. J. Agardh, 

 Corynophloea haltica Kuetz. Phyc. gener. p. 331, Sp. p. 543, Co- 

 rynepliora haltica Kuetz. Tab. PJiyc. VIII, t. 2, f. II?. — Fronde sub- 

 globosa varieciue lobata, olivaceo-brunnea, demum cava, lilis peri- 

 phericis clavatis, articulo terminali inflato; sporangiis 35^17. 

 Uah. ad Ahnfeltiam plicatam, Corallinas alias^jue a.l- 



