CHARACEAE PLATENSES 221 



Obs. Planta speciosa, robusta, erecta, parcissirne comosa, subco- 

 rymbosa, irregulariter incrustata, obscure virescens. Caules 

 erecti (20-25 cent, long.) robusti, crassiusculi (1-1,4 mllm. 

 crass.), subrigiduli, tenuiter griseo-incrustati, crusta densiuscule 

 anulatim interrupta, partes autem opacae griseo-virides, partes 

 pellucidae virides, quandoque incrustatae majores, quandoque 

 minores, 3-4-nodosi, internodiis longiusculis (4-6 cent, long.), 

 parce ramosi; rami cauli similes, elongati (3-7 cent, long.), 

 simplices rarins 2-4-furcati, saepius longe 1-cellularibus, tan- 

 tum ápice nodosi, rarius nodo altero medio ornati. Folia quan- 

 doque tota nuda v. ápice excepto (et tándem exsiccationis causa 

 cúpula rigidula conico-bemispbaerica, calyptram cujusdam 

 musci referens, seceditur), tetramorpba: forma primaria, Sim- 

 plicia, cylindracea, postice subattenuata, antice obtuse acutato- 

 rotundata (4- 10 mllm. long. = 0,7-0,8 mllm. crass.); forma 

 secundaria elongata, ramululiformia (1-2 cent. long. — 1 mllm. 

 crass.), ápice 3- (saepius 4)-6-foliis formae primariae similli- 

 mis coronata; forma tertia articulo basali minime evoluto (1-3 

 mllm. long. z=i 1 mllm. crass.), ápice foliis 2-6 formae prima- 

 riae v. vix minoribus ornato; forma quarta articulo basali plus 

 minusve evoluto (1-15 mllm. long. zr 1 mllm. crass.) ápice glo- 

 merulum foliorum abortivorum compactum atque minutum (1-3 

 mllm. diam.) gerente. Verticilli per caulibus atque ramis 

 pauci, remoti, subheteromorphi ; steriles 2-4-inferi paucifolii, 

 8-12-foliati (fol. 6-8frm. I, et 2-4 frm. II), ceteri 2-4- superi 

 densifolii, 16-24- foliati (fol. 4-8frm. II, cet. frm. I); fértiles 

 ad apicem caulis rarnorumque 2-4, aproximati, substipati, saepe 

 capitulum referentes, multifolii, 12-18-foliati (fol. 12-16 frm. 

 III, et 2-4, rarissime 0, frm. IV). Sporangia et antheridia de- 

 siderata. 



Incrustationis interruptae causa, praecipitationes acquarum 

 intermitientes (aestivo tempore abundantes, hiemali vero nullae) 

 et incrementum plantulae continuum intercalareque ; ramuli ac 

 folia verticillorum sénior um tota incrustata, juvenilia ac valide 

 evolventia tota nuda, v. vix hinc inde remotissime anulo mí- 

 nimo ornata ; notabile tamen : basis caulis atque ramorum ve- 

 tustorum nuda, folia autem verticilli apicalis nec non saepe 

 ejus internodium dense totaliterque incrustata. 

 var. N. laguroides Speg. 

 Diag. Eunitella, monarthra, furcata, heteropliylla, monoica (?), 



