8EIROSPORA, 



| 



don, us Aiii/iosperms. :is Xc/ifzo/>cf<i//ni>. the 

 cot\ ledons appi ;ir to he lour. six. or QBOW 

 in niimlier ; hut tin- observations of l)u- 

 chartre show that there exist only two 

 bifid, iriliil. en- mnltilid cot \ ledons. In 

 Other Cases, a- in O/v///-s tin- emhiyo remains 

 imperfectlv de\ eloped. ;ind appears :is a 

 mere cellular mass in tin- ripe seed before 

 germination: this is destitute of alhumen ; 

 hut in ( h-ofi(i>ic/n' :in amorphous embryo IS 

 found imhedded in tin- albumen. 



Mini., (iriit-ntf inn-ks <>n /infant/. 



SLlKOS'l'ni; A. llarv. A genus of (V- 

 ramiaceie ( MiorideoiK AlgM'i, containing oae 



rare species, ,S'. (i'ri//i(/isiint<i, -,\ lit tie crimsoii 



feathery sear-weed.oompqiea of sinrle jointed 



tubes, {ho joints being fra versed by artjcu- 



hilrd filami -ills. The spores an- unknown; 



hill Illi- I, /ntSfinrt'fi. \\ ll'u'll srl'\r lodislill- 



piisli this |)l:nit rn.in tin- (\illitlnunnin. occni' 

 in l<Tinin:il h.'iidcd fltrings, being formed 

 out of tin- raiuidi. 



Mi i-.i.. Harvey, Mar. Al<j. 170. 

 SK'.irs, l\ocli,= rrV/;/^/.wx, pt. (Koch, 

 r^r.v. 1L': Murniy, AV-. lint. 104.) 



SELAGINEL'lJA, !> Beaov. ATODUI 



of L\co|Hidi:ic.';c, disi iii^uished from Li/r,,- 

 jHHliuin hy 111- 1 presence ,,f two kinds of 

 f-)i<,ivs iini'i I In- dissimilar habit. 



This p:onus includes only one of our 

 native ('lull-mosses, S. .^>///n,sv/s ( Li/r. xc/df/i- 

 noi<h'*}\ l)ilt most ol'tlie so-called LyOMKNWI, 

 in\v so e\lensi\ely cultivated in Wnrdian 

 OMBt, i'eni-hoiisrs. \-c., liclonr to this di\i- 

 S'IIMI (ti-. l'^' s ,p. 481). The principal parti- 

 culars relating to these plants, especially 

 Ihe reiuarl\ahl<' history of thereproducti. in hy 

 Ilie spores, are niven under LYCOPODIA- 



Mir.l.. See |,NC(.|'(t|.|A' ' 



SKI.KMTK. r rhis well-Known mineral 

 8uhst:ince consists of crystsiHi/.-d hydrate,! 

 sulphiitc of lime. Its crystals belong to the 



ohliqne prisn: in : and tin 1 colours 



exhibited bv thin laminre, into which they 

 may be easily split, are very beautiful under 

 p.'hiri/ed light. Polarizinff cry.-tals :ind 

 ;mic sulistiinces. in \\hieh the Ihickness 

 is not suited to the production of distinct 

 colours under the polariscope, may be made 

 to exhibit them by placing a plate of sele- 

 nite heiie;ith the object. For this purpose, 

 the phite is usually kept mounted in Canada 



hals;im. See Pol.AIM/ATHiN. 



SI-;LK;I-: IMA. r.r. & Sch. A g.-nus of 



'u-liacroii-i Mo- es, including cerlain 

 - of authors : ha\ii:L r th> leaves seta- 



on-. ;m d the :ipsiile< pyrifomi. 



Si;M)TM<:KA, Woods. A genus of 



| 



Juager ntaanieA | Hep*tic), mostly tropical; 



Mil- species of which. -V (Jii)HJ.) /( /1,.,/x/V. 



occurs rarely in the mountains of the S.W. 

 of Ireland (de\oid of fruit ). 



'MM.. 1 1. .ok. llr. /'/. ii. pt. 1. I L >({; /.V. 

 ./*/////. plJ'.C.; MKart, .S'////. ,Ju,nj. pi. VI. f. 108; 

 Kndlicher. Gen. Vlanl. Supp. L;No. 473 H'. 



SMN !;( '!( ). The surface of the acheenia 

 or seed-like fruits of the common groundsel 

 (Senteio nift/tin*) is sparingly clothed with 

 !l\ii;sofa peculiar character. These ap- 

 l>ear to consist of two M>III {cylindrical cells 

 a implied to--ether by their flat faces, so as to 

 form a Kind of tube with a vertical septum. 

 \\ hen placed ill water they expand some- 

 what, and the contents are expolfed from the 

 ends, consisting of an indistinctly spiral- 

 fihrou.s structure, \\hidi untwists' ami ex- 

 pands by the absorption of water, to twice 

 or three times the length of the hair . in a 

 manner comparable in some degree to the 

 h'ha\iour ot the contents of the hairs of 

 AC\MHA< i:.i:. (Lei-.rluon.-4wn. N. H. vi. 



L'.V.'.I 



S I ; I ' ! I )( )M ML A family of Ilyphomy- 

 ceious I'ungi, consisting of a hetexogeneoQi 



assemhla-'e of imperfectly Known genera, 



and differently defined bv differanl authois. 

 Those nvnera'we have include.l in onr list 

 are enumerated in Lindley's ' X'e^vtahle 

 Kingdom;' but 1-Vies includes Oiilhnn and 

 others. '1'he general cliara< (er of the fjimily 

 is, that the plants produce spores 1\ ing im- 

 mediately umm the decumhent tilaiuents 

 of the mycelium, or upon short pedicels. 

 Genera; 



Arfntrniin*. luitophytic; tilaments creep- 

 ing 1 , persistent; spores springing from the 

 middleof the filaments, simplest length free, 

 spinous. 



Hr/)itinninm. Filaments woolly, septate, 

 exanescent ; spores o'lohosc, connate, scabrous, 

 stalked, solitary, at len; ih heaped to^ciln-r. 



I-'itfiin/mrinni. Spores fusiform or cylin- 

 drical, glued toget her in heaps resting on t he 

 gelatinous matrix. 



J-:/i<></,,iiuin. Spores heaped, oblong, api- 

 culate, septate, adnate to the matrix, inter- 

 wo\en \viil, the ell'iised, entangled, slender 

 filaments of the mycelium. 



/'.fi/ttnirt. Spores simple, pellucid, not 

 glued together, at first covered by the con- 

 verging tilaments of the mycelium. 



Mnnotituftnra. Epiphytic"; filaments creep- 

 an. scent; spores globose, solitary, 

 terminal, at length free. 



A.<t, roplinra. Filaments creeping, ranmli 

 branched, the fertile terminating in a spiral 



