138 
ACTAS DE LA ACADEMIA NACIONAL DE CIENCIAS 
D. cacheutensis, nov. spec. 
Lám. XVI, fig. 198, 199. 
Frons simplex late linearis, rliachi valida longitudinaliter sulcato-striata. Pinnae sub- 
coriaceae, lingulatae, subinaequilaterae (dimieliis inferioribns latioribus) ápice acumina 
to - rotundatae, in parte frondis inferiori basi contracta raclii affixae, in superiori basi- 
bus decurrentibus magis minusve confluentes frondem pinnatifidam reddentes. Nervi pin- 
narum primarii crassiusculi, superne canaliculati, apicem versus evanescentes, in nervu- 
los dissoluti, (in species vivas mibi notas: 
Denaea alata J. Sm. et D. noclosa J. Sin. nervi primarii in apicem excurrunt) nervi se- 
cundarii angulis acutis ex primariis egredientes vix vel leviter curvati, indivisi vel (ple- 
rumque) furcati vel (rarius, praecipue apicem versus) repetito clichotomi. Species ar¬ 
gentino et magnitudine et adumbratione pennarum formis minoribus D. Hughesi Feistm. 
aliquantulum appropinquat 1 ); ambae a generis typo (D. marantaceae Heer) ñervo pin- 
narum primario apicem versus discrepant. D. Hughesi, ut jam el. W. J. Dun 2 ) monuerat, 
rliaclii bifurcata et ejusdem frondis pinnarum diversitate eximia, fortasse melius Ínter 
Thinnfeldias militat. Planta nostra a Thinnfeldiis — e. g. Th. lancifolia (Morr.) Szajn. 3 ) 
— facile pinnarum circumscriptione carumque insertionis modo distinguitur, sed dum 
fructificatio specierum quaerundarum ignoratur, positio genérica carum dubia manet. 
Formatio rhaetica. 
Cacbeuta (E. Glaser) et Las Higueras prope Jocoli (Dr. José A. Salas), provinciae 
Mendoza. 
Subfamilia: Angiopecoj)teric!ae 
Asterotheca Presl. 
Presl, Supplem. tentam Pteridogr. (1847) 277. 
Stur, Scbatzlarer Scliichten (1885) 183-190. Firg. 23. 
Schimper, Traite I (1869) 583 ( Asterocarpus Goepp.) Atl. plant. XLI, fig. 15, 16. 
Schimper - Sclienk, Paleophytae (1890) 89, fig. 65. 
Zeiller, Paléobot. (1900) 59, fig. 26. 
Frondes magnae, bi-vel tripinnatae, usque ad 2 m. longae et 0,5 m. latae, rliaclii-vali- 
da basi ad 3 cm. lata, probabiliter stipulata. Pinnae ovatae, basi lata vel subcontracta ses- 
siles, exaphlebiatae, pinnulis brevibus, linealibus, ápice rotundatis vel oblique subacumi- 
natis. Nervus primarius pinnularum bene distinctus, in apicem excurrens; nervii secun- 
darii plus minus frequentes prope basin semel furcati vel ramo bifurcationem uno iterum 
bipartito. Pinnulae vel segmenta fertilia sterilibus aequalia; sori majusculi e sporangiis 
3-6-8 (plerumque 4) compositi, secus marginem pinnularum seriatim collocati, nervorum 
lateralium medio vel bifurcationem corum origini affixi. Sporangia deplanato — obovata, 
q Feistrriantel l. c. IV. 1. pl. VI, fig. 2. X; XIX, fig - . 2! 
2 ) Dun, l. c. In connection with a New South Wales form and the Indian D. Hughesi, (lie great simularity 
in the form of the pinnules and the venation to some of the lanscolate pinnuled species of Thinnfeldia is re- 
markable the solé tangible difference being- the greater size of Dancieopsis. I venture to thinlr in contradistinction 
to the late Professor Feistmantel, that the relationship between the Indian species, even as proved by bis own 
figures - which show at the basal portion of the frond small lobate pinnules similar in every respect to those of 
Tinnfeldia - is mucli in the absence of fructification, to Tinnfddia than to Heers Dancteogsis. 
3 ) cf. Lám. XVIII, fig. 174, lám. XIX, 
