770 BULLETiN DE l'iierbier boissier. Clevea. 



Antheridia aggregala, irregulnriter hiseriata. Pedimculus receplaculi plus 

 minus longus, interdum brevissimus, e costcC pagiiia antica — stralo hypo- 

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

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

 slomatis parvis haud incrassatis, loiii 3 vel 4. profunde discreti, monogyni, 

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

 bilabiata, labiis tenerrimis, verticalibus in a^tate late hiantibus. Calyplra 

 tenuis. Capsula sphrerica, matura haud exserta, irreguiariter valvatim 

 dehiscens, pariete unistrata, fibris annulalis vel semiannulalis instructa, 

 vertice celhilis majoribus suboperculata et utriculos breves annuliferos 

 in lumen capsulse pendulos gerens. Elateres breves, vix attenuati 3-4 

 spiri. Sporae dense grosseque papulosEe. 



1. G. hyalina (Somm.) Lindb, 1. c. p. 291. 



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

 Plagiochasma erythrospermum SuII. Acad. Philad. 1869. 

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

 Clevea suecica Lindb. Musci scand. p. 1. 



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

 dala. 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 magnse, frondis mar- 

 ginem longe superantes, hyalinae, obhque lunatse, in acumen longissi- 

 mum arcuatum, integerrimum apiceque filiforme attenuatse. Pedimculus 

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

 pressus vel subteres, apice paleaceus, paleae pallidce, integerriniEe, lanceo- 

 latse longeque cuspidatse, margine basaU paucis laciniis lihformibus 

 pinnatse. Receptacula pro more quadriloba, lobis antice ad V» fissis, labiis 

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

 ginese, 51 [jl. Elateres concolores, 98 ji, fibris laxe tortis. Antheridia irre- 

 gulariter biseriata. 



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

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

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

 Rocky Mountains (Macoun), ubique in solo calcareo. 



67 



