724 BULLETIN DE l'HEHBIEK U01SS1EK (2" ie SÉR.). 1905 (16) 



parce et minute piloso-denticulata), dorso late carinatis (carina viridi, usque ad 

 0,3 mm. alta, ad basin versus seasiin humiliore apice acuminata), basi auricula 

 truncato-rotundata ornatis; sporophyllis dorsalibus maximis c. 2 mm. longis, 

 c. 0,70-0,75 mm. latis ; sporophyllis ventralibus aequilateris, e basi dorso auricu- 

 lata (auricula truncato- biloba) ovato-deltoideo-cymbiformibus, longiuscule 

 acuminatis, subhyalino-pellucidis, ubique cellulis subscleroticis scabriusculis 

 prosenchymaticis, margine piloso-denticulatis (pilis dentiformibus usque ad 

 0,03 mm. longis), dorso carinatis (carina viridi, vix ultra 0,1 mm. alta ad basin 

 versus humiliore, apice acuta, ad apicem versus parce piloso-denticulata) ; sporo- 

 phyllis ventralibus maximis c. 1 1 /a mm. longis, c. 0,7 mm. supra basin latis; 

 macrosporangiis in axillis sporophyllorum ventralium plurimorum; micros- 

 porangiis in axillis sporophyllorum ventralium superiorum et dorsalium 

 omnium sitis; macrosporis usque c. 0,27 mm. crassis, suiphureo- vel subauran- 

 tiaco-albidis, latere verticali costis commissuralibus obscurius sulphureis vel 

 aurantiacis ornatis, celerum fere laevibus, obsolete et minutissima foveolatis; 

 microsporis c. 0,035 mm. crassis, croceis, ubique minute verrucoso-granulalis, 

 costis commissuralibus tenuibus parum perspicuis rectis praeditis. 



Species Selaginellce helerostachydi Bak. proxime affinis habituque similis, 

 differt foliis lateralibus subœquilateris vel parum solum insequilateris, foliis 

 intermediis sensim acuminatis sed non in cuspidem aristiformem contractas, 

 sporophyllis dorsalibus carina altiore praeditis minus inœquilateris et longioribus, 

 microsporis minus crebre verrucoso-granulatis, macrosporis sublœvibus latere 

 rotundato obsolete et minutissime solum foveolatis. 



Habitat id regno Siam, distr. Raheng, c. 16° 30' lat. bor., in silva aperta 

 Wang Chow prope Tapotsah (E. Lindhard n. 17; 18. m. Jan. 1904). 



APPENDIX 



100. Ustilago Arundinellae Brefeld. 



The spikelets of Arundinella setosa Trin. (No. 73) are attacked by a fungus 

 which Prof. Dr. E. Rostrup has been kind to name as Ustilago Arundinellœ Bref. 



