Angiospermae, Dicotyledonese, Archichiamydse, Amentacese, Betulaceae, Alnus. 257 



13. Betuia Vicetinorum Mass., Syll. pl. foss., p. 47 (nomen). 8,57 



In calcareo margaceo «Chiavon» in agro Vicetino (Mass.). — 



Maxime convenit cum Betula fruticosa Pall. Varietates has nomine 



tantum distinguit cl. Massalongo: elliptica.nana, vulgaris, rhom- 



bea, normalis, ohliqua, cuspidata. 



Gen. Alnus Tournef., Instit., t. 359. 



Arbores et frutices sylvestres et paludosi. Folia plerumque caduca, 

 petiohita, simplicia, ovata, pro more duplicato-serrata, .symmetrica, 

 pinnatinervia, nervis secundariis craspedodromis in dentes majores, 

 tertiariis in denticulos excurrentibus. Inflorescentia amentacea; amenta 

 mascula cjlindracea, feminea ovalia. Strobili in corjmbos aggregatt, 

 e squamis lignescentibus, post maturitatem patulis compositis. 



1. Alnus Crescentii Mass., Synop. FL foss. Senog., p. 25; Fl. foss. 868 

 Senig., p. 173, t XXIX, f. 9, t. XLI, f. 3. Schimp., Tr. pal. v6g., 



II, p. 585. — Foliis ovato-ellipticis, breviter petiolatis, parvulis, 

 subcordatis, denticulatis, craspedodromis, costa valida; nervis se 

 cundariis parallelis, subsequidistantibus, subsimplicibus , nervulis 

 transversis, conjunctis, venis minutissimis flexuosis. 



In marga gypso.sa miocenica a Sinigaglia n in agro Umbro (Mass.). 



— Fol. mm. 12 long., ram. 8,5 lat. (Mass.). 



2. Alnus Gastaldii Mass., Synop. Fl. foss. Senog., p. 25; Fl. foss. 869 

 Senig., p. 174, t. IX, f. 15, t. XLIV, f. 6. Schirap., Tr. pal v6g., 



II, p. 585. — Foliis ovato-orbicularibus, membranaceis, longe pe- 

 tiolatis, basi vix subcordatis, apice subattenuatis, argute crenulatis, 

 penninerviis, costa tenui, nervis secundariis, utrinque 6, rectis, 

 aequidistantibus, parallelis, oppositis marginem versus subramosis, 

 nervulis strictis, percurrentibus, obliquis, sequalibus parallelis, ve- 

 nis perpendicularibus in rete solutis. 



In marga gypsosa raiocenica « Sinigaglia o in agro Umbro (Mass). 



— Fol. mm. 47 long., ram. 35 lat. (Mass.). 



3. Alnus gracilis Ung., Chlor. protog., p. 116, t. XXXIII, f. 5-9; ,970 

 Geu. et Spec, p. 399. Ludw., Palfeontogr., VIII, p. 96, t. XXXI, 



f. 9, 10, 12, 13. Heer, Fl. tert. Helv., II, t 37, t. LXXI, f. 8-12; 



III, p. 176, t. CLII, f. 4. Ettingsh., Foss. Fl. v. Bilin, p. 48, t. XIV, 



f. 21-22; XV, f. 1-4. Gaud., Contr. Fl. foss. ital., 2 M6ra., p. 40. 



tab. III, fig. 7-8. E. Sism., Prodr. Fl. tert. Piem., pag. 10; Mate- 



riaux, Mem. Acc. Torino, XXII, p. 425, t. IX, f. 6. Ettingsh., Foss. 



Fl. Leoben, Denk. Ak. Wien, LIV, p. 286, t. II, f. 22., Schenk, in 



17 



