136S 



PLATANUS 



ciiiidta. Hort.l. Lvs. cuneate or truncate 

 at the base, deeply 5-lobed, with narrow, elongated, 

 coarsely toothed lobes. Gn. 1, p. 572, 573; 20, p. 371. 

 Var. undulita, Ait. (var. cune&la, Loud. P. cunetUa, 

 Willd.). Often shrubby: Irs. short-stalked, smaller, 

 usually deeply 3-lobed and cuneate, with narrow-toothed 

 lobes. Gn. 1, p. 618; 20, p. 371. 



P. racembsa. Nutt. (P. Calitornica. Benth.). Tree, to 100 or 

 120 ft., with a trnnk often divided into several stems: lvs. usu- 

 ally cordafB ..r tniiv^it*. deeply 3-5-lobed. with ovate-liineeo- 



late.mostlv . i.tu, l - i,:tletomentosebeneath. 6-10 in. long; 



fr.-he.idv ( u the slender stalk, racemose. Calif. 



S.S. 7;:>J- ' ^i.a'h. comprises all si>ecies of the ge- 



nus. — /' 11 ' I' " U li- Tree, to 80 ft., often divided into 

 several ^t. ;n.^ . ;.,-.. u.Li.illy cordate or truncate, deeply 3-7- 

 lobed, with luiiceohite, acuminate, entire or dentate loljes, to- 

 mentose beneath or nearly glabrous at length, 6-8 in. long: 

 fr.-heads racemose, rather smooth, each on a short stalk. New 

 Mex. and Ariz, to Calif. S.S. 7;3'29. 



The other species, as P. Ueiicana, Moric which is some- 

 times planted as a street tree in Mexico, P. Lindeniana, Mart. 

 & Gal., and P. gtabrdta. Fernald, aU natives of Me.\., are not 

 yet introduced. Alfred Rehder. 



, rnrya, nut; alluding 

 Fortunea. JuglandA- 

 ruished from all other 

 iiiinff an upright cone- 

 ' : T)ip branches with 

 ■ •■ i^ilcs: Irs. odd- 

 / ' ' " . but smaller; 

 : : iiiiiial, solitarr: 



PLATYCARYA r , 

 to the sli:,| 1 ;i 



Juglanihu'fic i'\ II - i-i • 

 like spike. .Small a.-.-,. 

 solid pith : wiuter-bud.s ' 

 pinnate, similar to thosi 

 staminate catkins axilhu 

 fr. a small, winged nut in 'ii :ix;i- 1 densely imbri- 

 cated, rigid and sharply pointiil hmeeolate bracts form- 

 ing a terminal upright cone. Rarely cult, and probably 

 not hardy north of the Middle States. It has graceful 

 and interesting foliage, but its ornamental value is not 

 great. Prop, by seeds and by layers, probablr also by 

 grafting on Hicoria. 



strobil&cea, Sieb. and Zucc. (Fnrlunea Sindtsis, 

 Lindl.). Small tree, with upright glabrous branches: 

 Irs. 8-12 in. long; Ifts. 9-17, sessile, oblong-lanceolate, 

 falcate, acuminate, doubly serrate, pubescent only on 

 the midrib beneath, 3-4 in. long: fr. -bearing cone about 

 1-lH in. long, oral, brown. Summer. Japan, China. 

 S.Z. 2:149. F.S. 4, p. 32Gb. R.H. 1888, p. 88. 



Alfred Rehdek. 



PLATYCfiRIUM (Greek, broad horn: alluding to the 

 shape of the Irs.). Polypodiiceie. Stag-horn Fern. 

 An anomalous genus of ferns with irregularly lobed 

 thick Irs. with the sori forming irregular patches orer 

 one or both surfaces. The sterile Irs. are flat, rounded 

 expansions closely adherent in layers to the substratum. 

 In their natire forests these ferns grow to the surface 

 of trees and old plants and often form enormous nests. 



Eight kinds of Platycerium are offered for sale in 

 America. The word "disk,' as used below, refers to the 

 widest unbranched portion of the fertile frond. 



A. Plants not forked like a stag horn...\. 

 AA. Plants resembling a stag horn. 



B. Sori borne on a special receptacle 



described under iVo. 2 2. 



BB. Sori borne on the last forks ornear 

 their base. 

 c, Barren fronds stag -horn -like 

 aboi-e. 

 D. Fertile fronds in pairs. 



e. Plants glabrous or nearly 



lowisli wool 



DD. Fertile fronds in S's 



cc. Barren fronds not stag -horn- 

 like, entire or mereli) lobed. 

 D. Sf'jmriit.s .111,1 sinnsrs of llu 



Angolense 

 biiorme 



PLATYCERIUM 



1. Angolense, Wehv. (P. ^Ihiipiciim .v&t. Angolinse, 

 Welw.). Fertile fronds wedge-shaped in outline and 

 merely wary at the margin. It is also distinct by reason 

 of felt-like covering of rust-colored wool on the lower side 

 of the fronds. Barren fronds large, erect; fertile fronds 

 attaining a length of 18 in. and a width of 9 in. at the 

 top: spore-mass nearly as broad as the frond. Angola 

 (West Africa). G.C. III. 23:155 (repeated in 28:444). 



2. bifdrme, Blume. According to Blume's plate and 

 description, this differs from all other kinds in having 

 the spores borne on a special appendage, which is kid- 

 ney-shaped and attached b:'ow the first fork. Blume 

 says there are 2 such appendages ; that the barren 

 fronds are roundish, entire below, lobed above: fertile 

 fronds 3-5 ft. long, many times forked, pale green. 

 Java. — The fertile fronds of P. biforme are said to grow 

 15 ft. long sometimes. The picture in Gn. 4, p. 295, 

 labeled P. biforme seems to be distinct and anomalous, 

 though somewhat like P. grande. 



3. grinde.J. Smith. Fig. 1848. This maybe readily 

 distinguished from P. alcicome by its barren fronds, 

 which are also stag-like, while those of P. alcicome are 

 not. Barren fronds stalkless; segments blunt, spongy, 

 pale green, tomentose: fertile fronds in pairs, 3-6 ft. 

 long: sori not at the base of every ultimate fork but 

 against the upper edge of the disk, with an infertile 

 fori: i'rr,'rctiTr_' tievond on either side. North Australia. 

 (i < 1-7' ii;:. III. 8:97 (good, repeated in III. 10:698 

 ami - i ' hir. 5:169 (same as A.F. 6:701). F. 

 1> ■ ,. F.S. 6, p. 156). Not G.M. 40:135, 

 wliili I- /' .i:' lt,',picum. Mn. 1, p. 77 (erroneously as 

 P.ttb'i,:,,,;,,). 



4. WAllichii, Hook. As in P. grande, the sori are 

 borne not at the base of the ultimate forks, but on a 

 disk which is not squared off at its upper surface but 

 rounded and projectjiiir iiit<i tin- ;uii;le Ijetweenthe forks. 

 Sori roundish. 3Iala^ 1'. niuMila. G.C. III. 28:435. 

 Hook. Fil. Exot., plat.- 'JT. 



5. WilUnckii, JI<."r. . lii-tiiiL'in-.lied from P. grande 

 by the sori, which !i.:iiiy lill ih.- I:ist forks but do not 

 approach the base ,,t tli.' ~iiiii~. The fronds are thinly 

 furnished with minut.^ ^t. Ibit. haMs, at length glabrous 

 and pale prrcen. JIo,.rc -a\-: ' f. riilc fronds in 3's, elon- 

 iratc. pr-Tt'l.-i!*. vj:!- ^ -rir. . '' "i' h-k. Idpartite for about 



tv- 'i,,,,i_ ..1 ,1 , ', , ! th,. margins of each 



pMi ! ,,,,,,.. I , I ring numerous lobes 



ill . i : iiiMus plan." Strong 



t'.-anir. - -ii ilii- jilaiii ar.- ila- h nL,'tli, narrowness and 

 acuteiiess of the forks, and also the narro-ivness of the 

 "disk" or unbranched portion just below the primary 

 forks. Java. G.C. II. 3:303 (repeated in HI. 10:701 and 

 28:431, A.G. 15:111. Gn. 10, p. 383 (repeated in Gn. 

 30, p. 300). 



6. .Sthidpicom, Hook. (P. Stemmdria, Beauv.). Bar- 

 ren fronds rounded ; fertile fronds 2-3 ft. long, clus- 

 tered, pendent, twice dichotomous (not twice trichot- 

 oraous, as some writers say) : sorus a V-shaped patch 

 surroundins; the sinus. Guinea, Angola. Hooker's 

 Garden Ferns, plate 9. A.G. 15:111. G.M. 40:135 (erro- 

 neously as P. grande). -The fronds are said to be cov- 

 ered belriw with a thin cottony down. 



7. HilUi, Moore (P. alcic6rne, va.T. Hillii). Barren 

 fninds like /'. iihi,„rne, but the fertile fronds are erect, 

 the unbranched portion longer, the forks more numer- 

 ous and compact, the segments shorter and more 

 acute. Fronds clustered thinly, corered when mature 

 with white stellate hairs: sori in oral or roundish 

 masses, not at the base of the sinus but near the base 

 of each of the last segments. The upper third of the 

 fertile frond is "15-18 in. across, 3-parted, the central 

 segment with 1 or 2 side lobes near the apex, the 2 lat- 

 eral segments broader and twice or thrice forked into 

 5-10 ultimate lobes." T. Moore. Queensland. G.C. II. 

 10;.-|1, 428, 429. .J.H. III. 32:497. 



s. alcicfime, Desv. Barren fronds rounded, convex, 

 wavv ni:irL'ined: fertile fronds clustered, attaining 2-3 

 ft..j-:! times dichotomous, the unforked portion erect. 

 the scijnieuts pendent, rather narrow and sharply cut, 

 under surface covered with thin cottony down: sori in 

 irnt'ular masses tilling the last forks and a space 

 across their bases, shown in B.R. 3:262, 203 (as J cros- 

 tichini, ,ilcicorne}. Temperate Australia. A.G. 14:153; 



