780 bulletin de l'herbier boissier. Plagiochcisma. 



6. P. crenulatum G. Hep. Mex. p. 266. 



Monoica. Minor, viridis, subtus purpurea. Frons usque ad 15 mm. 

 longa, 8 mm. lata, semper ex apice innovata, interdum ramulos maseulos 

 e latere costee proferens. Stomata magna, 8-9 cellulis conicis 6 serialis 

 circumdata, parietibus radialibus maxime trabeculatim incrassatis; cel- 

 lulse epidermidis trigone incrassatae. Squamae posticse late semilunatae, 

 appendiculis saepe geminatis ovato-oblongis vel late linearibus, breviter 

 acuminatis. Carpocephala subsessilia, vertice plano-convexa , longius 

 barbata. Sporae et Elateresl Andrœcia semper in ramulo proprio, e 

 latere costae orto vel basi apiceque consécutive 



Hab. Mexico (F. Müller, Liebmann). 



7. P. algericum St. n. sp. 



Dioica, pusilla, fusco-viridis, subtus subatra. Frons 5-6 mm. longa, 

 sterilis obovato-oblonga, dichotome ramosa vel ex apice innovata, ramis 

 fertilibus late obeordatis, carnosa, aus attenuatis nullis, postice valde 

 convexa. Stomata parva, ore amplo, cellulis 6 obeonicis circumdato; 

 cellulae epidermidis haud incrassatae. Squamae posticse parvee, late semi- 

 lunatae, appendiculo acquilongo haud constricto, lanceolato acuto. Carpo- 

 cephala subsessilia, peduneulo brevissiino, apice longe barbato, trilobata, 

 vertice plano-convexa; involucra a dorso visa ovato-trigona, longitudi- 

 naliter carinata, ad medium connata, horizontaliter patula, duplo longiora 

 quam alta, ore angustato bilabiata, subtruncata. Sporae 85 jju Elateres 

 300 pu bispiri. Andrœcia ignota. 



Hab. Algeria (Trabut). 



b. Carpocephala vertice plus minus excavata. 



a. Macroporœ. 



8. P. cordatum L. L. Pug. IV, p. 13. 



Monoica, major, viridis, subtus haud colorata. Frons usque ad 20 mm. 

 longa, 10 mm. lata, antice plana, postice parum convexa, costa lata, alis 

 adscendentibus attenuatis, plicatulo-crispatis, crenulatis. Stomata magna, 

 ore amplo, cellulis 6-7, obeonicis, quadriseriatis circumdato. Squamae 

 posticae rosese, magnas, imbricatae oblique semilunatae, geminatim appen- 

 diculatae, appendiculis longis, approximatis, parallelis, linearibus, acutis, 

 margine grosse eroso-dentatis. Carpocephala peduneulata, peduneulo 



77 



