Marchautia. franz stepham. species hepatigarum. 383 



inflatum. apice abrupte angustatum subrostralum, ore minimo, basi e 

 margine bulbi ortum. tenue. Ca/js«/rtlongiuspedicellata, vixexserta, sub- 

 globosa, magno bulbo inserla, 4 valvulis rumpens, pariete dense annu- 

 lalim incrassala, sub apice utriculis magnis brevibus annuliferis el in 

 lumen capsulse pendulis aucta. 



Calyptra tenerrima^ basi bistrala. Elateres 170 ji, flavescentes, bispiri, 

 subfiliformes. Sporae 60 a. reticulatim lobato-cristatse. rufo-brunneae. 

 Androecia breviter pedunculata. capitulo disciformi. cavernoso, margine 

 attenuato crispato-plicatulo. centro antheridia aggi-egata gerente. ostiolis 

 bi-evissimis. squanice posticse hyalinffi. tenerrimse margine varie laceratae. 



• 1. Preissia commutata (Ldbg.) Nees. Hep. Eur. lY. p. 117. 

 Syn. : Marchantia commutata Ldbg. Hep. Eur., p. 101. 

 Preissia quadrata (Scopolil Nees. 1. c, p. 13o. 

 Preissia niexicanaSt. Hedwigia 1883. lY, p. 1. 

 Hab. Europa, Ani. sept. et Asia sept. haud rara. Groenlandia (Yan- 

 hoeffen). Alaska (Krause). Sibiria (Arnell), Japan (Miyoshi, Faurie), 

 Italia, Hispania in montosis. Hinialaya (Duthie), Mexico (Juergensen). 



iVlARCHANTIA L., 1753 



Sp. pl. II, p. 1063. 



Plantee frondosse, terrestres, arcte repentes, majusculse vel magnae, 

 validse et coriacege. Frons plus minus late ligulata. furcata (furcis secunda- 

 riis solum floriferis) antice plana, apice profunde inciso-biloba. Costa bene 

 evoluta, lata humilisque, rarius abrupte producta, promore in alas tenues 

 sensim attenuata. Stratum hypoporum semper humile, cavernis amplis, 

 filis chlorophylliferis opuntiacis confertis. Stomata composita, antice 

 conico prominula, humilia, poro magno aperto, postice conico-cylindrica, 

 in lumen cavernarum pendula, poro inlerno plus minus parvo, subquad- 

 rato vel quadrifisso vel cruciformi vel filifero. Squanise postica^ utroque 

 latere triseriatge, series prima costse insidens, parva, canali rliizifero sub- 

 marginalis, series secunda magna, appendiculata, series tertia margini 

 frondis approximata, ligulata. Inflorescentia semper dioica. Andrcecia 

 pedunculata vel disciformia crenatoque lobata vel profunde palmatifida, 

 ventre squamuligera ; antheridia numerosissima, radiatim seriata, alveolis 



155 



