566 DUMORTIERA. 
Britannicis inventa est, quoniam D. irrigua (Wils.)—forma D. 
hirsute europea, capitulo supra calvo (nec hirsuto)—quoque in 
Audibus crescit. 
1, DUMORTIERA HIRSUTA (Swartz). 
Marchantia hirsuta Sw. Prodv. Fl. Ind. oce. 145. Dumortiera hirsuta 
Nees, Hep. Eur. IV., 163. Hygropyla wrrigua Tayl. de March. in Linn. 
Trans. XVIL., 390, t. 15, f. 1. 
Hab. In scopulis saxisque rivulorum et cataractarum humectatis; in 
Andibus sylvaticis inferioribus magis frequens quam quisqualis 
Marchantiacea et perseepe fertilis: locis Chimborazo, Tunguragua, 
‘anelos, Campana, Tavalosos, &c.; in planitie solum ad Yurimaguas 
fluvii Huallaga et ad fluvii Negro cataractas visa.—In totis terris 
calidis et temperatis inventa est, pro more autem rarius. In Pyrenzis 
et in Hibernia pulcherrime crescit. 
Pedune. 20-30 ; capit 4-5 ; setw 15-2°0; cal 2°3x1°8 5 elat 0-'9™™, 
Frondes late vel flavo-virides, tenues prostrate, in plagas latas effusee, 
8-10 longee, ad 2™ late ubi latiores, lato-ligulatz, superne dilatate, 
plane, apice profunde emarginate, interdum dichotome ; supra 
subtiliter irreculariter reticulato-venose ; subtus ad costam radicellis 
prelongis tenuibus bifariam patulis, adpressis venasque simulantibus, 
hirsute ; cellulee majusculee tenues bistrate, costam versus 3—4-strate, 
superficiales papilloso-prominule (unde frondes in vivo insigniter 
velutin), strato hypoporo proprio nullo, poris nullis vel perraris 
et minutis; costa purpurascens, biconvexa vel supra fere plana, 
validiuscula, axi cellulis perangustis pluristratis constante-—Frondes 
haud raro subter costz apice iteratim innovantes, innovationibus 
spathulato-orbiculatis-cuneatisve, basi insigniter abrupteque angus- 
tatis. 
Flores dioici, raro heteroici. Pedunculus florescentize 9 validiusculus, 
‘eum frondis costa continuus, hine sulcis binis angustis exaratus, basi 
apiceque paleis angustis lineari-subulatis flexuosis, interdum valde 
numerosis, rarius perpaucis nullisve, stipatus, ceeterum nudus, raro 
setosus. Capitula orbiculata subconvexa, supra setis conspersa, 
rarius calya, margine sub 8-loba. Involucra tot quot lobi, mono- 
carpica, pauca fertilia, turgide tubularia, carinata, demum ab apice 
bilabiatim hiantia, extus longisetosa. Calyptra subaequilonga, obo- 
vata, chartacea, apice inequaliter triloba, persistens. Pedicellus 
calyptra subbrevior, sat crassus, basi rotundatus. 
Capsula semiemersa, globosa, rufo-badia, profunde 8-fida, laciniis 
revolutis apice plurifidis ; substantia tenuis, cellulis fibras annulares 
includentibus. Elateres preelongi, medio dispiri, utroque fine attenu- 
ato autem solum monospiri. Spore globose, elateribus diametro 
duplo latiores, tuberculose. 
Andreecia plerumque in distincta planta, brevipedunculata ; capitulum 
disciforme, margine rhizinis ciliatum, intus locellatum (juvenile 
solum visum, antheridiis nondum formatis). 
Var. irrigua (Tayl. sp.). Cum stirpe Hibernica ad amussim fere convenit, 
capitulis supra levissimis, etc.—In spelunca ad pedem montis 
Tunguragua. 
