368 BAZZANIA. 
plicato-convolutze, apice truncate, bifidee, bispinoseeve, raro integre ; 
antheridia bina longistipitata, raro solitaria. 
Hab. Loca umbrosa, in sylvis montium preecipue, ad saxa, arborum 
truncos et ramos, necnon in truncis prostratis et putrescentibus, 
rarius in ipsa terra, plagas preelatas sistens, seepe super alias hepaticas. 
muscosque flagellis suis validis radicantibus reptans. 
Distr. Per orbem terrarum ; in zona temperata boreali speciebus 
solum 2 (ut videtur) constans; inter tropicos et in zona temperata 
australi, in Australasia pre aliis, formes numerosissimee—forsan ad 
species sane haud permultas referende—invente sunt. Ipse in 
sylvis Andium et flum, Amazonum species circiter 19 legi. 
Obs. Folia nunquam (ad Micropterygii instar) complicata, margine 
postico autem (nisi ipsa basi, ubi recurvula) leniter incurvula. In 
speciebus foliis apice ineequaliter bifidulis donatis (sc. B. anisostoma, 
inequilatera, &c.) heee incurvatio tali modo augetur ut folia canaliculata 
evadunt, itaque ad Micropterygium sensim accedunt. 
The species of this genus are a standing puzzle to hepaticologists. They 
are all so alike in habit and in their more obvious characters that a casual 
observer would unhesitatingly refer them to the same genus; but when 
we try to define the species, we find it difficult to assign them positive 
limits. Out of the wealth of material I amassed in the forests of the 
Amazon and Andes I could easily frame double the number of “species” 
here recorded. The forms I have grouped under the name Bazzania 
bidens, for instance, might seem to other observers equivalent to 3 or 4 
distinct species; but when I find West Indian forms differing slightly 
froin all these, but (like them) showing no character that I could account 
specific, I have concluded to let them stand as varieties of a single species. 
—Several Oriental species with opposite leaves are known, but only a 
single American, B. Peruviana (Nees.), which, singularly enough, I never 
gathered, nor have I been able to see a genuine specimen of it. 
§ 1. Folia apice bidentata. 
1. B. bidens (L. et L.) Subpusilla flavida rufulave. Folia parvula 
laxiuscula semiovato-lanceolata lineariave, dentibus apicis brevius- 
culis acutis. F!* 4 plo breviora subquadrata, apice 4-crenata-denti- 
culatave, interdum subintegra. Per. tenuia, tota longitudine trigona,, 
ore ciliolata—Var. vittata 8S. Folia breviora semiovata, cellulis 
mediis discoloribus distincte vittata—Var.? dissodonta 8. F. semi- 
ovato-ligulata, dentibus longis acuminatis, F!* solum duplo breviora, 
apice grosse 4-dentata, vel 4-fida, margine interdum utrinque 1-2- 
spina. [Potius species propria.|—Var. heterodonta 8. F. tridentata 
cum aliis normaliter bidentatis admixta. F"™ sursum crescentia, 
superiora late cuneato-quadrata longidentata. 
§ 2. Folia apice tridentata, raro etiam in eadem stirpe 2-vel 4-dentata, 
rarissime (¢ dentibus lateralibus obsoletis) apice subintegra. 
A. Foliola parva, foliis 2-5plo minora, basi haud (vel via) cordata. 
EF. basi vntegerrima. 
