1 66 Prof. Don's Descriptions of two new Genera of the 



hemisphere. A species of Juniperus occurs at Cape Horn, and one species of 

 Thuja in Chile, and another at the Straits of Magellan ; while Callitris, a 

 genus containing more than twenty species natives of New Holland and Van 

 Diemen's Land, has a solitary species on Mount Atlas in 36° North latitude. 



CRYPTOMERIA. 



Ord. Nat. Conifers. Linn. Juss. 



Trib. n. CupREssiNEiE. Rich, 



Character Essentialis. 



Amenta mascula spicata. Squamce antheriferce rotundatee, adpress^ imbricatse, 



sessiles. Antherarum thecce 5, connatse ! basi squamarum omninb adnatse, 



anticfe foramine amplo dehiscentes. Strohili solitarii, globosi, squarrosi : 



squamis h pericarpio 3 — 6-dentato bracteaque lanceolata acuminata in- 



fern^ concretis compositis. Semina 4 v. 5, erecta, insequilateri-oblonga, 



margine angustfe alata. 



Character Generalis. 

 Flores monoici. 



Masc. Amenta plurima, ovato-oblonga, obtusa, sessilia, bracteata, unguicu- 

 laria, in spicam terminalem vix uncialem aggregata. Bractece subulatae, 

 rigidse, patulse, amento parum brevioi'es. Squamce antheriferce sessiles, 

 brevissimse, rotundatee, undique adpress^ imbricatse, ferruginese, hinc 

 convexse, laevissimse, margine angust^ membranacese ; extimse obsolete 

 carinatse, subapiculatse. Antherarum thecce 5, rarius 4 v. 6, brevissimse, 

 uniloculares, turgidoe, inter se connatse, basi squamarum omnin6 adnatse, 

 antice foramine amplo dehiscentes. Pollen h cellulis globosis leevibus 

 compositum, pulverem sulphureum semulans. 



F(EM. Amenta in ramulorum apice terminalia, solitaria, sessilia, globosa, 

 multiflora : squamis h pericarpio 3 — 6-dentato bracteaque lanceolata acu- 

 minata infern^ concretis compositis, crassis, coriaceis, rigidis, unguicu- 

 latis, regione placentifera dilatata, fungosa, vix protuberanti : ungue 2 

 lineas longo, verticalit^r compresso, hinc obtusfe elevato-carinato, inde 

 rectiusculo, convexo, sulcato. Ovula 4 v. 5, erecta, atropa, ovata, 

 compressa, verticalia, invicem se subimbricata, margine angust^ alata, 



