209 



b. Forma vaginis in mucum luteo-ruacum diffluentibns. 



Hab. ad oraa Angliae, Hiberniae, Hispaniae, Galliae et Belgii ; 

 h. Cap lCartin prope Mentone (Dr. Boettoher). 



Spccics insignis, et habitu, et fabrica interna, trichomatibus gracil- 

 limis primo intuitu distinguitnr. 



R. pulchra Crwn. (in Eabenh. Alg. N. 1450. Hedwigia 18G3. 

 p. 62.). 1!. subglobosa, confluens, obscurc aeruginca, plicata, intus 

 eava; trichomatibus aerugineis, densc aggregatis subgracilibus , rcctis, 

 vel lenitcr curvatis , in apicem piliformem flaccidum dilute coloraturn 

 vel subachroum acuniinatis , distincte articulatis; articulis vix tumidis, 

 infimis diametro duplo triplove brcvioribus, omnibus homogeneis; vaginis 

 in nmcum matricalem diffluentibus , achrois vel luteo-fuscis (in uno 

 codemque thallo) ; cellulis perdurantibus globosis decoloratis, articulorum 

 infimorum diametro paulo majoribus. 



Diam. art. inf. pleiumque l /m'" = 0,00047", cell. perd. 7i 75 "' 

 = 0,00051". 



Hab. ad litus prope „ Palermo " (C. Cramer). 



Species mihi non sat notae. 



R. durissima (Physactis durissima Ktz. Phycol. germ. p. 186. 

 N. 3.). R. minima (magnitudine seminis papaveris), saturate aeruginea, 

 nigrescens, globosa , durissima , elastica; trichomatibus basi \iiso'" cras- 

 sis , dense aggregatis ; vaginis achrois , maxime pellucidis. — In Ce- 

 mamio rubro prope Dobberan legit beat. de Flotow. 



R. aggregata (Physactis aggregata Ktz. in bot. Zeit. 1847. p. 178. 

 If. 149.). R. aerugineo-atra, minuta, lenticularis ; trichomatibus densis 

 turgidis (diam. l 300 — V 250 '") » cuspidatis , basi subtorulosis. (Diam. 

 thalli l j2 u ')' — In mari boreali leg. Jiirgens. 



R. botryoides Carmich. (in Harv. Manual p. 150.). R. minuta 

 aggregata, rotundata, rugosa , ferruginea , cartilaginea ; trichomatibus 

 dichotomis. — In rivulis Angliae. 



R. atropurpurea (Physactis atropurpurea Ktz. Osterprogr. p. 9. 

 K\ 20.). R. plana, irregulariter orbicularis , atra ; trichomatibus laxe 

 dispositis , rectis , strictis, cito acuminatis, piliferis , amethystinis, apice 

 achromaticis. — In Phycoseri gigantea ad Cherbourg leg. Le Jolis. ■ 



Species mihi nomine tantumnotae. 

 Physactis Lloydii Ktz. Osterpr. N. 21. (Rivularia Balani Lloyd) 

 ex Ktz. — In Balanis. 



Ph. obducens Etz. (1. c). — ln Laurencia obtusa. 



Rabenhorst, Flora Europaea. II. t4 



