i6 
Wheldon : Key to the Harpidoid Hypna. 
39. Nerved to base of subule or a little higher, but not percurrent :: 
nerve percurrent or excurrent (40 ) . 
40. Leaves rather small and crowded, usually more or less purplish r 
nerve reddish (41). Leaves larger, 4-7 mm. long (43). 
41. Densely tufted, short, with crowded branches : leaves oval, 
strongly falcate, crisped (W. stenophylla var. purpurascens f. Renauldii ) . 
Taller : leaves form an oblong -lanceolate base, more feebly falcate - 
secund : not crisped (42). 
42. Almost entirely purpurascent (W , stenophylla var. purpurascens 
f. typica). Green, blotched with purple (W. stenophylla var. pur- 
purascens f. versicolor) . Entirely green above \W . stenophylla var. pur- 
purascens f. virescens) . 
43. Nerve distinctly excurrent (44). Nerve not excurrent (46). 
44. Nerve stout (80-90 [x at base), not much narrowed above, .and 
excurrent in a short stout point : stems denuded below, and bristly with 
remains of leaf -nerves (IE. Rotae var. irrigata). Nerve narrowed above 
and ending in a long fine point : nerve 80-110 ju at base (45). 
45. Excurrent nerve of moderate length (W . Rotae). Nerve very 
longly excurrent as a bristle-like awn (IE. Rotae var. trichophylla) . 
46. Nerve penetrating far into subulate point (47). Nerve ceasing 
in lower part of acumen, 55-70 /a at base (50). 
47. Plant usually green or brown, leaves distinctly serrate all round : 
alar cells usually thin (48). Plant usually more or less purpurascent r. 
alar cells coloured and their walls thickened (49). 
48. Nerve 40-76 [x wide at base : monoicous (IE. serrata). Nerve 
60-9O [x wide at base dioicous (IE. serrata var. mildei). 
49. 5 _I 5 cm. high : leaves longly subulate, spirally twisted and' 
slightly and remotely denticulate : nerve 80-90 [x at base, gradually 
lost in subule (W . stenophylla) . Submerged, 20-25 cm. long, regularly 
pinnate : br. leaves narrowly linear and flexuosely spreading, giving a 
plumose habit (IE. stenophylla f. inundata). 
50. Tufts purplish-brown to blackish (IE. glaciate). Tufts pale 
green, reddish within, elongate and slender : leaves rather distant, with 
involute undulate margins : habit of certain slender N. American- 
Fontinalis (IE. glaciate var. fontinaloides) . 
LIST WITH REFERENCES TO AUTHORS’ DESCRIPTIONS. 
Scorpidium (Schimp. Bry. Europ.) Limpr. Laubm. Deutschl. III., 520. 
1. S. scorpioides (Linn. Sp. PI. 1127) Limpr. Laubm. Deutschl. III., 
520 ; Braithw., 54 ; Dixon, 546. ^ 
var. typicum Wheldon v. nov. 
f. virescens Wheldon f. nov. 
f . fuscescens Wheldon f . .nov. 
f. versicolor Wheldon. 
var . angusti folium (Sanio ‘ Bryolog. Fragm. II.' Hedwigia, 1887,. 
129). 
var . gracilescens (Sanio in Klinggr. Leb. und Laubm. Ostpreuss., 
281). 
var . julaceum (Sanio 'Comment, de Harpid. Europ. in Bot.. 
Centraib. 1880/ p. 20). 
f . flavovirens Wheldon f . nov. 
f . fuligi-neum (Sanio. ‘ Bryol. Fragm. II.’ in Hedwigia, 1887). 
f. rubro tine turn Sanio. loo. cit. 
2. 5 . turgescens (Jens., Vidensch Medd fra Naturh. foren. i. Kjob., 
1858, 63) Wheldon ; Braithw., 244 ; Dixon, 549. 
(To he continued). 
Naturalist 
