167 



rhidii miiu' singulio formantur sjjliajrospora;. nunc 2 oppositse, 

 nunc plures verticillatic. Iii iis, quaruni in articulis singula3 

 nascuntur sphajrospora;, lia; in diversis articulis ita disponun- 

 tur ut lineam spiraleni per partem fructigeram, in his ple- 

 rumque teretiusculam, at supra sphserosporam magis intume- 

 scentem, efticiant; ita in Folysijihonia. \\\ iis vero Greneribus, 

 quorum frondes sunt complanatse, stichidia quoque sa^pe com- 

 l)hinata nascuntur; in his sa^pe in singulis articulis formantur 

 spha?rosporse geminse, quse utroque latere linese medise opposita^ 

 disponuntur. In aliis Generihus stichidia teretiuscula et fere 

 siliquajformia liunt {I)asya etc); sphferosporse in his ssepe ver- 

 ticillata) generantur. Ubi sphserosporse in eodera articulo sunt 

 plures, hse sunt contemporanea? et eodem tempore mature- 

 scentes; in omnibus vero stichidiis normale videtur sphsero- 

 sporas diversorum articulorum ordine ab inferioribus ad su- 

 periores adscendente maturescere, ita ut ssepius conspiciantur 

 stichidia, in quibus sphserospora- inferiorum articulorum jam 

 emissa;, media? sunt maturescentes, dum in suprema parte novi 

 articuli novis spha?rosporis nascentibus prsegnantes generantur. 

 Hinc facilius explicatur stichidia sub evolutione formam sen- 

 sira mutare, ita ut, quse ovata institui coeperunt deraura prse- 

 longa et cylindracea adpareant — hujus exiraia in Dasyse 

 speciebus habeas exempla. 



Evolutionis quodamraodo contrariura ordinera in tilis ar- 

 ticulatis, quse geramidia fovent, obtinere olim statui; in his 



cells. — — At the base of the ceiitral cell a small portiun of proto- 

 plasm is detaclied, which theu soon divides trausversely into two, the 

 lowernnost of which forms a very minute parallelogram, aud the other 

 speedily assuuies an oval form ; tliis latter remains attached to the 

 former, aud this point of attachment forms iu a iittle time a stalk, upon 

 which the globular or oval cell beariug the tetraspores is borne. The 

 basal cell scarcely increases iu size, but the upper one very rapidly 

 enlarges - — ". Si observi^tioues his verbis expositas, rite iuter[)re- 

 tatus suni, cellulas duas articuli interiores, quai'um superior iii spliaj- 

 rosporam abit. inferior vero itievoluta rnanet, quoqiie vidit Wriglit; 

 dum vero ipse has cellulas judicavi divisione siphonis pericentralis 

 ortas, Wtight easdem a siphone centrali separatas statuit. Quod si 

 ita esset, lioc sane non bene cuin origine sphaerosporarum in aliis*!'"io- 

 rideis conseiitire v'deretur, si quidein sidi.erospor^e nornialitcf in strato 

 corticali evidentius nasciinlnf. Ncc milii rlncil (|ii(iiiio(i(i piotoplas 

 matis pars sejiararctiir a centfnii sipjionc insi iliaiihragmale fViiiiiaio. 



