770 bulletin de l'herbier boissier. Clevea. 



Antheridia aggregata, irregulariter biseriata. Pedunculus receptaculi plus 

 minus longus, interdum brevissimus, e costa3 pagina antica — Strato hypo- 

 poro recedente — ortus, haud sulcatus, basi nudus, apice pro morê palea- 

 ceus vel non. Discus centralis carpocephali minimus, laxe cavernosus, 

 stomatis parvis haud incrassatis, lobi 3 vel 4, profunde discreti, monogyni, 

 leniter decurvi; involucra conico-cylindrica, antice leniter carinata, apice 

 bilabiata, labiis tenerrimis, verticalibus in aetate late hianübus. Calyptra 

 tenuis. Capsula sphaerica, matura haud exserta, irregulariter valvatim 

 dehiscens, pariete unistrata, fibris annulatis vel semiannulatis instructa, 

 vertice cellulis majoribus suboperculata et utriculos brèves annuliferos 

 in lumen capsulae pendulos gerens. Elateres brèves, vix attenuati 3-4 

 spiri. Sporae dense grosseque papulosae. 



1. C. hyalina (Somm.) Lindb. 1. c. p. 291. 



Syn. Marchantia hyalina Somm. Magaz. Nat. 1833, 1, p. 284. 

 Plügiochasma erythrospermum Süll. Acad. Philad. 1869. 

 Fimbriaria nana Ldbg. Hep. Eur. p. 110. 

 Clevea suecica Lindb. Musci scand. p. 1. 



Dioica, parva, glauco-virens vel purpurascens et limbo hyalino circum- 

 data. Frons ligulata vel oblonga, regulariter dichotoma, rarius ex apice 

 innovata, usque ad 12 mm. longa, tenera, tenuis vel magis robusta et 

 costa abrupte prominente. Stomata valde prominentia, parietibus radia- 

 libus normaliter valde incrassatis, incrassatione stellatim attenuata (unde 

 Leitgebii nomen « Astroporae »)• Squamae posticae magnae, frondis mar- 

 ginem longe superantes, hyalinae, oblique lunatae, in acumen longissi- 

 mum arcuatum, integerrimum apiceque filiforme attenuatae. Pedunculus 

 receptaculi quoad longitudinem variabilis, usque ad 1 cm. longus, com- 

 pressus vel subteres, apice paleaceus, paleae pallidae, integerrimae, lanceo- 

 latae longeque cuspidatae, margine basali paucis laciniis filiformibus 

 pinnatae. Receptacula pro more quadriloba, lobis antice ad V' fissis, labiis 

 ilaque profunde discretis, apice rotundatis, integerrimis. Sporse ferru- 

 gineae, 51 ja. Elateres concolores, 98 \l, fibris laxe tortis. Antheridia irre- 

 gulariter biseriata. 



Hab. Alpes Europœ, Italia Appenini Montes (Gasparini), Fennia (Bro- 

 therus), Grœnlandia (Yahl), Germania, Harz (Wallroth, Yocke) Norvegia, 

 Spitzbergen (Berggren), Caucasus (Brotherus), Lapponia (Lindberg), 

 Roclnj Mountains (Macoun), ubique in solo calcareo. 



67 



