266 MB. F. STEPHAtfl's REVISION OP 



the frond. In AntJioceros arachnoideus they form a regular net- 

 work, and the dry plant looks as if overrun by a small Cephalozia. 

 Our European species have geminate antherse ; in A. dila- 

 tatus, Steph., from Fernando Po, we find them as many as 

 20 in each cavity. This variability is quite exceptional in He- 

 paticse, which are distinguished by very constant numbers of 

 reproductive organs within the range of a genus and even of 

 a tribe. 



7. Anthoceros lamiistferus, Steph., sp. n. 



Monoica, olivacea, siccando subnigra, plagas orbiculares 4 cm. 

 in diametro formans. Frondes adscendentes, in centro radicantes, 

 in lacinias lacinulasque numerosas sensim dissolutce, basi distincte 

 costatse et fere ad costam reductse, crassce, cavernosa, antice planae, 

 postice valde convexse ; lacinia) minus distincte costatse minusque 

 cavernosa, costse cum alis tenuibus sensim confluentes ; super- 

 ficies antica lamellis longis tenuibus percursa, laciniae ultimse lan- 

 ceolatae marginibus crispatis. Involucra singula, cylindrica, ore 

 haud angustata, parietibus crassis cavernosis. Capsula 3 cm. 

 longa. Pseudoelateres breviarticulati. Sporse nigrse, 0*035 mm., 

 denseque papillosse. Antherse geminatse, in alveolis costse im- 

 positse. 



If a section of the main axis of this plant be taken off and cut into 

 a series of transverse sections, it is easy to see that the stout costa 

 of the base undergoes a bifurcation and runs out by repeated 

 forking into all the lacinise; these branches are held together 

 by a thin lamina, that is, the costa forks long before the frond 

 becomes visibly bipartite; this can be seen also in Symphyo- 

 gyna and Metzgeria. There can be no doubt that Antlioceros 

 has a dichotomous mode of branching which is rarely perceptible. 

 I may add that our plant is certainly no Dendroceros, the midrib 

 of which is much more pronounced. 



8. A]S T THOCEROS pallets, Steph., sp. n. 



Monoica, flavicans vel dilute olivacea, in cortice putrescente 

 arete repens. Frondes 3-4 cm. longae, laeves, oblongae, inaequa- 

 liter lobatae, lobis rotundatis, ubique 5 cellulas crassae, laxe ca- 

 vernosce, superficie itaque sub lente reticulata. Involucra oblongo- 

 fusiformia, pariete basi 12 cellulas, apice 1 cell, crassa, cellulis 

 irregulariter prominentibus quasi aspera. Capsula 4 cm. longa, 

 robusta, Jlavo-rubescens, valvulis post dehiscentiam planis neque 

 tortis, haud raro uno latere solum fissa. Elateres fibra laxe torta 



