Dioon. 125 



B. Foliola margine dentibus spinulosis, 10 — 17 mm lata, in- 

 sertione basali 11 — 22 mm lata, nervis 11 — 24. Microsporo- 

 phylla apice sterili obtuso vel acuto. Macrosporophylla 

 lamina sterili valde abbreviata, obtusa vel subacuta . . . 3. D. spinulosum. 



1. D. edule Lindl. Bot. Reg. (1843) 59; Miq. in Tijdschr. Wis. en nat. I. (1848) 36; 

 Miq. in Verh. Nederl. Inst. IV. (1851) 7 t. e (<J); Lemaire in 111. Hortic. II. (1855) 91, 

 t. 3, 4; A.DC.inDC.Prodr. XVI. 2.(1868)537. — D. aculeatum Lemaire in 111. Hortic. II. 

 (1855) 92 (specimina juniora). — D. strobilosum Lemaire in 111. Hortic. X. (1863) 4. — 

 D. strobilaceum A. DC. in DG. Prodr. XVI. 2. (1868) 537. — Macrozamia litoralis 

 Liebm. Ic. ined. in Herb. Haun. — M. pectinata Liebm. Ic. ined. in Herb. Haun.— 

 Zamia rigida Karwinski in Herb. Leningrad. — Z. Friderici-Guilelmi Hort. Parm. — 

 Z. ? Maeleni Miq. olim in Linnaea XXVIII. (1844) 97. — Platyzamia rigida Zucc. in 

 Abhandl. Bayer. Akad. IV. (1845) 23 t.4. -Ic.:Bot. Mag. Gl. (1875) t. 6184 (<£); 

 Dyer in Hemsl. Biol. Centr. Americ. Bot. III. (1883) t. 81 f. 1, 2 ($); Goebel, 

 Organogr. Pfl. (1901) f. 692; Schimper, Trait. Paleont. V6g§t. Atlas (1874) t. 72 

 f. 8 — 11 (ex Corda, Verst. d. boehm. Kreideform. XLVI). — Truncus saepe obli- 

 que adscendens vel erectus, frequenter 1 — 1,5, usque ad 10 m altus, simplex vel 

 bifurcatus, apice interdum 2 — 3-capitatus, cicatricato-areolatus. Gataphylla dense 

 lanata. Petiolus semiteres, inermis, pagina superiore carina trigona, basi dense lanatus 

 et paulo tantum dilatatus. Rhachis semiteres, superne costa elevata semitereti, 

 in brevem spinam saepe cum summis foliolis valde reductis connata. Folia 1 m et 

 ultra longa, glabra, juniora lanuginosa. Foliola anguste lineari-lanceolata, apice 

 attenuata spinescentiaque , basi anadroma paululum, catadroma magis dilatata, 

 ibidem paulum supra insertionem basalem folioli sequentis deorsum decurrentia, 

 utrinque sulcis costae medianae juxtapositis angustissime articulata, insertione basali 

 7 — 17 mm lata, nervis 6 — 17, superne immersis, subtus striato-prominentibus, margine 

 revoluto integerrimo, raro denticulis spinosis erecto-patentibus 1 — 2 prope apicem, 

 perrigida, conferta, raro remotiora, saepe glauco-pruinosa, utrinque circiter 100 et 

 ultra, 11 — 15,5 cm longa, 4 — 8,5 mm lata. Foliola superiora brevia, infima valde 

 abbreviata, demum breviter spinosa. Foliola juvenilia 2,8 — 4 cm longa, 3—4,5 mm 

 lata, nervis 6 — 7, apice 1 — 3-spinoso-denticulata, margine denticulis spinosis 1 — 2. 

 Strobilus $ initio subglobosus, colore albido, demum elongato-cylindricus vel oblongus, 

 totus extus albido-griseo-lanatus, apice obtuso, 20— 30 cm longus, 6,5 — 9 cm latus, 

 pedunculo 4 cm longo, digitum crasso, sordide fusco-tomentoso. Microsporophylla 

 cuneiformia, 10 — 28 mm longa, 7 — 19 mm lata, pagina superiore glabra subpruinoso- 

 atroviolacea, linea costali mediana acuta pertrusa, in apicem sterilem sursum recurva- 

 tum subdeltoideo-triangularem, in mediis microsporophyllis acutiorem vel in acumen 

 breve acutum 5 mm longum desinentia (in inferioribus et superioribus magis ab- 

 breviatum), omnia tomento albido denso obducta, parte fertili biloba. Microsporangia 

 binatim quaternatimque, saepe ternatim aggregatae, ellipsoideo-globosa, numero 

 circiter 300 in singulis microsporophyllis. Strobili $ 1 — 2, ampli, ovoidei, densissime 

 lanuginosi, laxe imbricati, primum erecti, demum penduli, maturi 20 — 30 cm longi, 

 diametro 12 — 20 cm, pondere 5 — 6 kg, pedunculo brevissimo plerumque vix conspicuo. 

 Macrosporophylla 9 — 10 cm longa, 3,5 — 4,5 cm lata, breviter stipitata, pedicello ad 

 5 cm longo, pilis longis albidis arachnoideo-intricatis vel brunneis dense obtecta, dorso 

 atque ovulis et supra dimidiam superiorem faciei interioris glabra, parte basali 

 glabra viridescentia vel sulphureo-lutescentia, basi ovula gerente valde incrassata 

 tumida, plus minus producta, interdum pseudopedicelliformia. Lamina sterilis longe 

 producta, ovato-lanceolata, apice plus minus acutiusculo, raro in acumen acutum 1 cm 

 longum producta, margine irregulariter subrepando vel subcrenulato, basi dilatata 

 utrinque subauriculata. Macrosporophylla inferiora late-lanceolata, nulla aut abortiva 

 ovula gerentia. Semina in strobilo $ 100 — 300, ovoideo-subglobosa, lutescentia vel 



