Treubia. franz stephani. spegies hepatigarum. 17 



paucis pistillis sterilibus cincta. Capsula in pedicello longiusculo sphee- 

 rica, majuscula, irregulariter rumpens, bislrala; cellulae parietum externae 

 magnse, hyalinse validissimae. Sporx magnae, reticulalim lamellatee, 

 lamellis allis asperis profunde foveolaLse. Elateres decidui, brèves, bi- vel 

 Irispiri, spiris laxe lorLis. Antheridia in facie antica frondis aggregata, 

 bracteis monandris, reticulalim connatis circumdata, celerum sphaerica in 

 pedicello brevissimo. 

 Duae species tantum cognitse : 



1. Petalophyllum Ralfsii (Wilson) G. Syn. Hep. p. 472. 

 Syn. : Jungermannia Ralfsii Wilson Engl. Bot. Suppl. tab. 2874. 



Fossombronia corbulœformis Trabut. Atlas FI. Alg. 1886, p. 7. 



Petalophyllum lamellatum Lindb. in Meddel. Soc. F. FI. fenn. I, 



p. 91. 



Frons innovatione duplici, inlerdum simplici continuala, lamellis sim- 



plicibus in planta cf anostomosantibus, planis percursa. Perianthia bre- 



viter inflato-cylindrica, ore repando, pauci-spinoso. Sporœ 76 |x. Elateres 



ad 200 [1, bispiri, spiris laxe tortis, 



Hab. Britamiia. Gornwall (Ralfs, Curnow); Hibernia (Wilson); Alger 

 (Trabul). 



2. Petalophyllum Preissii G. Syn. Hep. p. 482. 



Frons pro more furcatim innovata, lamellis ad costam anostomosan- 

 tibus, crispatis. Perianthia campanulata, ore varie profundeque laceralo. 

 Elateres trispiri, tenuiores quam in précédente. Sporas haud vidi. 



Hab. Australia. Swan River (Drummond.); adhuc haud reperta. 



TREUBIA Gœbel. 



Plantse frondosae, magnae vel maximae, flaccidse, olivacese, radicellis 

 longis arcte repentes, terricolae, longe lateque expansse. Frons plana, 

 monopodialiter ramosa, ramis irregulariter disposais, ramis intercalaribus 

 e latere costcC ortis rarissimis. Costa lata, basi angusta et subteres, 

 superne plano-biconvexa , sensim in alas attenuata, utroque latere 

 convexo-prominiila; cellulse internae corlicalibus multo minores; cellulae 

 centrales costarî longiores, anguslse, fasciculatim aggregalae, antice brac- 

 teifera ; bracteae biseriatae, parvae, margine supero loborum approximatae, 



MÉMOIRES DK l/HKKrtlKli HOISSIER, 11» 16, 2o juill 1900. 70 



