326 PORELLEA. 
perbrevi constantes, Lractece bijuge, raro plures, bilobe, foliis 
acutiores, margine semper ciliate denticulateeve ; bracteola apice 
integra vel subbifida. Perianthia emersa subovalia, a fronte com- 
pressula, preter ad basin leptodermia, sectione trigona, carinulis 
autem utraque facie sepe adjectis, ore primum subconstricto demum 
hiante sgpeque bilabiato, 10—20-laciniato. Calyptra plus duplo 
brevior, supera, globosa brevicolla carnosa (in’ P. ptilopst basi 
8-10c., superne 5c. crassa; in P. platyphylla inferne 4-, apicem 
versus 2-strata, cellulis minutissimis), basi pistillidiis sterilibus 
7-30 circumdata, apice demum bivalvis. Pedicellus brevis, peri- 
anthio solum duplo longior, validus, cellulis alternis 12-20 in 
diametro, apice subdilatato interdum ad 24c. latus. Capsula magna 
rufula globosa, ad basin usque 4-valvis; valvulee fissiles, demum 
pro more inequaliter trilobz, raro tota longitudine inter se dis- 
junctee, basi autem et paulo altius ad suturas integree. Cellulee 
exothecii sat magne et alta, 4-8-gone, superiores tam late quam 
long, inferiores oblong (subrectangulares), omnes columnis 
validis rubrofuscis ad angulos fulcite. Endothecium tenue, facile 
(seepe pedetentim) secedens, cellulis parvis, irregularibus, fibra 
pertenui inclusa obscure reticulatis vel plane vacuis, aliarum 
specierum 2—4-stratis, aliarum solum 1-stratis, conflatum. lateres 
numerosissimi breviusculi tenues 2-3-spini decidui. Sporce magnee, 
elateribus 3-5-plo  latiores, subglobose, asperule.  <Andrecia 
brevispica julacea, ramum totum vel ejus apicem solum tenentia; 
bractee confertee opposite, mediante bracteola cum  contrariis 
connate, turgiie, subinequilobee; antheridia constanter solitaria 
magna ovali-globosa stipitata. 
V. PORELLA, Dill. Hist. Muse. (1741). 
Lindberg, Utredning af Skadinaviens Porella-former (1869). 
Madotheca Dum, Comm. bot. (1823); G. L. et N. Syn. Hep. 
(1844). 
Genus ad diem unicum, 
Hab, In sylvis montanis ad arborum truncos et ramos, necnon ad 
saxa, raro in terra inter fruticulos. 
Distr. Inter tropicos magis abundant species; in zona temperata 
boreali haud infrequentes ; ultra tropicum Capricorni autem 
multo varius eveniunt. In Andibus species sub 8, cum pluribus 
varietatibus, legi ; infra 600 metr. alt. autem et in tota planitie 
Amazonica nullam invenire potut. 
