Pîagiochasma. fra^z stephani. spegies hepaticarum. 783 



220 a. flavescenles, omnino solidi lumine nullo fîbraque spirali nuiïa. 

 Andrœcia rotunda vel bifurca, vel in planta propria vel in ejus ramis 

 brevibus posticis. 

 Hab. Mexico (Liebman, Maury, Fr. Müller, Berendt). 



14. P. Wrightii Sull. Musc. An», t. YI. 



Syn. Aitonia Wrightii Und. Hep. Am. in 111. Si. Lab. II, p. 43. 



Bioica, mediocris glauco viridis, postice purpurea. Frons usque ad 

 2 cm. longa, ex apice innovata, late ligulata, anlice subplana; costa lata, 

 humilis, alis attenuatis. Stomata magna, parum convexa, poro amplo, 

 cellulis 6 obconicis, 2-3 seriatis circumdata. Squamœ poslicse purpurese 

 parvae, late semilunatEe, appendiculo basi constricto, ovato, acuto, integer- 

 rimo. Carpocephala breviter pedunculata, pedunculo 3-4 mm. longo, 

 crasso, apice breviter paleaceo, capitula vertice profunde biloba, lobis sinu 

 amplo acuto divergentibus, apice mamillatis. Sporae 72 p. Elateres 136 ^. 

 Andrœcia ignota. 



Hab. Texas (Wright). 



/S. Micropora. 



15. P. rupestre (Forster) St. 



Syn. Aitonia rupestris Forster, Comm. Soc. Gott. IX, p. 73. 

 Pîagiochasma Aitonia Nées, Nalurg. Eur. Leb. IV, p. 41. 



Bioica, mediocris, viridis, subtus purpurea, valida. Frons usque ad 

 2 cm. longa, 6 mm. lata, rarissime dichotoma, pro more ramulis posticis 

 e latere costae ortis innovata, antice plana, postice piano convexa, costa 

 lata haud prominente. Stomata parva, poro minimo, cellulis 5, parvis 

 obconicis circumdato. Cell, epidermidis valde incrassatee, trigonis magnis 

 seepe trabeculatim confluentibus. Squamœ posticee imbricatee, purpureae, 

 late semilunatae, abrupte appendiculate, appendiculo anguste lanceolaîo, 

 acuto, integerrimo. Carpocephala subsessilia, longe barbata, paleis an- 

 guste lanceolatis apice longe flliformibus, normaliter quadriloba, vertice 

 lobis adscendentibus anguste foveolata. Sporae 72 \i. Elateres 200 ^, tris- 

 piri, spiris anguste tortis. Andrœcia in ramulis posticis rotunda vel 

 oblonga, seepe 2 vel 3 dense consecutiva. 



Hab. Europa mediterranea, praecipue Grrœcia (Heldreich), Madeira 

 (Holl et Exped. Novara), Tenerifa (Krause), Abyssinia (Beccari, Penzig.), 

 Cap (Breutel). 



80 



