HOOKERIACEAE. 287 
atis. Archegonia numerosa. Seta cirea 3 mm. longa, erassiuscula, 
flexuoso-cygnea, ubique, praecipue ad apicem tuberculis perhumilibus 
Ke ra 
yalinis leniter corrugata (platytuberculata) a ¢ 
operculo vix 1 mm. longa, horizontalis vel subpendula, badia, turgide 
ovata, operculo pPevardstre pallido. Calyptra minima, oe mpa- 
nulata, apice laevi, inferne ciliis fuscts densissime obtee 
Per istomii dentes externi arete lamellati, lamellis fats valde, 
ib 
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anguste sae ae late perforatis, leniter papillosis, ciliis haud visis. 
Hab.: Kennedy’s Bush, Port Lyttelton Hills, Christchurch. Coll. 
R. eee This appears in Brown’s herbarium as ‘‘ Hookeria ; traced 
290.’ 
e small size, and the very narrow border of the rag together 
with the rather small areolation for Eriopus, suggeste 
species of Distichophyllum; and on comparing it with D. erve 
Besch. from Fuegia, it became evident that it was dlaealy allied to 
that oie nbaseaty, indeed separable, though constantly, except by 
the much shorter apiculus of the leaf. Consultation with M. Thériot, 
however, on the matter has led us to the conclusion that ae plants 
must be certainly placed in Eriopus, the smooth (or almost smooth) 
seta—shared with EF. apiculatus—being rime outweighed by the 
nerve, the areolation, and other characte 
PTERYGOPHYLLUM Brid., Bry. univ. ii, 341 (1827) ex p. 
The New Zealand species of this genus are all hygrophytic; and 
like some aquatic groups of flowering plants, e.g. the Batrachian Ran- 
unculi, Callitriche, Potamogeton, they are very plastic and variable, 
so as to oon a difficult problem to the systematist. Hooker in the 
Handbook N.Z. Flora (p. 492) sa says ‘‘The species of this section are 
probably all forms of one’’; a conclusion with which I should cer- 
tainly not quarrel, although I have here treated them as comprising 
two species, in addition to one described since the publication of the 
made for the well known variation of the New Zealand plants. 
Key. 
Plants of all sizes, the frond rarely 5 mm. wide, 
and usually pasyre ates less; leaves often dis- 
1 tant and ofte ackis. es i ea 2 
—— Od large; leaves very dense; frond 5-10 
; green or yellowish .. 2. quadrifarium 
Plant usually blackish; leaf margin denticulate or 
coarsely toothed; cells highly collenchymatous 1. dentatum 
2 Plant green; leaf margin entire or finely crenu- oe 
late; cells not markedly collenchymatous .... 3. distichophyl- 
loides 
