242 Muscineen. 



Von den Arten der Gattung Lejeunea entwirft Verf. folgende 



Uebersicht: 



Unterleaves present, normal in number (i. e. one for each pair of 

 side-leaves). 



Underleaves undivided. 

 Leaves entire. 



2 inflorescence borne on a principal brancL, without 

 innovations : 



Lojiholejeunea suhnuda Steph. 

 9 inflorescence borne on a very short branche, with a 

 Short, sterile innovation: 



{Platylejeunea). 

 Underleaves broadly reniform: 



Platylejeunea haccifera Steph. 

 Underleaves orbicular: 



Platylejeunea cry2)tocarpa Steph. 

 $ inflorescence borne on a pricipal branche, innovating 

 on one or (very rarely) on both sides : 



BracMolejeunea Sandvicensis Evans. 

 Leaves usnally more or less toothed at apex. 

 Underleaves decurrenl, reflexed at apex.: 



Marchesinia Mittenii Evaris. 

 Underleaves not decurrent, plane at apex: 



Thysananthus elongatus Evans. 

 Underleaves bifid. 



Leaves sharp-winted. 

 Underleaves with broad lobes (consisting of ten to many cells) 

 the sinus not extending beyond middle: 



Harpalejeunea . 

 Leaves acute to acuminate lobule large (about half as long 

 as lobe): 



Harpalejeunea pseudaneura Evans. 



Leaves apiculate, lobule small (about one sixth as long as 



lobe : Harpalejeunea oicaihiensis Evans. 



Underleaves with slender lobes (consisting of five to seveu cells) 



the sinus extending beyond the middle : 



(Drepanolejeunea). 

 Leaves entire or denticulate, acute * 



Drepanolejeunea Andersonii Evans. 

 Leaves incised-dentata, acuminate : 



Drepanolejeunea uncinata Steph. 

 Leaves rounded at apex or very blunt-pointed. 

 Leaves with two or three ocelli at base of lobe : 



Ceratolejeunea oculata Steph. 

 Leaves not ocellate. 



Leaves obliquely spreading. 



Leaf-cells thickwalled or papillose or both. 



2 inflorescense borne on a very short brauch (the 

 vegetative leaves represented by a Single un- 

 derleaf), not innovation on one side ; perianth 

 with a distinct antical keel : 



Trachylejeuna oacluiensis Evans. 

 $ inflorescense borne on a principal brauch or 

 on a short lateral branch (always with a few 

 vegetative leaves), innovating on one or on 

 both sides ; perianth plane or nearly so on 

 antical face: 



(Cheilolejeunea). 

 Underleaves contigous or subimbricated. 



Leaf-lobes about 1 mm long and 0,5 mm wide ; cells with 

 thin walls and scarcely evident trigones ; 



Cheilolejeunea atenoachiza Evans. 



