13. n o d o s u s ; frond compressed, dicliotomo-pinnate; branches strap-shaped,
attenuated at the base, remotely toothed and here and there swelling into
oblong air-vessels, wider than the frond; receptacles lateral, ovate, stalked.
(T ab . C L V I I I .)
14. Mackaii; cylindrical or compressed, dichotomous; air-vessels elliptical,
solitary; receptacles lateral, stalked, pendulous, near the base of the dichotomous
branches. (Tab. LII.)
15. canaliculatus; frond narrow, channelled, without midrib or air-vessels,
dichotomous, (T ab . CCXXIX.)
VI. HIMANTHALIA.
16. lo r e a ; frond top-shaped; receptacles repeatedly forked. (Tab. LXXVIII.)
Order 2. SPOEOCHNACEiE.
VII. DESMABESTIA.
1 7 . l i g u l a t a ; flat, obscurely midribbed, repeatedly pinnate; piimse and pin-
nulm opposite, lanceolate. (T ab . CXY.)
18. a c u l e a t a ; branches compressed, slender, bi-tri-pinnate; pinnee and pin-
nulm alternate, margined with subulate spines. (T a b . XLIX.)
19. viridis; frond filiform, repeatedly pinnate; pinnm and pinnulm capillary,
exactly opposite, patent. (T ab . CCCXII.)
VIII. ABTHEOCLADIA.
2 0 . v illo s a . (Tab. LX IV .)
IX. SPOBOCHNUS.
2 1 . p e d u n c u l a tu s ; stem undivided; branches lateral, simple; receptacles elliptical.
(Tab. LVI.)
X. CABPOMITBA.
2 2 . Cabrerse; irregularly dichotomous, linear, narrow, flat, midribbed;
branches here and there constricted. (T ab. XIV.)
O rd e rs . LAMINAJIIACE^.
XI. ALABIA.
23. e sc u le n ta ; frond lanceolate; midrib narrow, cylindrical; leaflets linear-
oblong or wedge-form. (T a b . LXXIX.)
XII. LAMINABIA.
24. d ig ita ta ; stipe cylindrical or compressed, elongate; lamina deeply cleft
into many linear segments. (T ab . CCXXIII.)
24.* Var. stmophylla. T a b . CGCXXXVIII.
25. b u lb o s a ; stipes flat, with a wavy margin, twisted at the base, rising
from a hollow, warted tuber; frond deeply cleft into linear segments.
(T ab . CCXLI.)
26. lo n g ic ru r is ; stipes very long, slender at the base, hollow and inflated
in the middle, tapering to the apex; lamina undivided, membranaceous,
oblong. (T ab . CCCXXXIX.)
27. s a c c h a r in a ; stem filiform, solid, expanding into a cartilagineo-coriaceous,
lanceolate frond. (T ab . CCLXXXIX.)
28. P h y llitis ; stipe short, subcompressed, gradually expanding into a linear-
lanceolate, delicately membranous, undivided frond. (T ab . CXCII.)
29. F a s c ia ; stipe very short, setaceous, ending in a membranaceous, wedge-
. shaped or lanceolate frond. (T ab . XLV.)
XIII. CHOBDA.
30. S lum ; frond filiform, veiy long, not constricted at the joints. (Tab. CVII.)
31. lom e n ta ria ; frond membranous, constricted at distant intervals, the interstices
inflated. (T ab . CCLXXXV.)
Order 4. DICTTOTACEJ;.
XIV. CDTLEBIA.
32. m u ltifid a ; polymorphous, flabelliform, irregularly cleft; laciniee acute, attenuate.
(T ab. LXXV.)
XV. H A L ISB E IS .
33. polypodioides; frond dichotomous, entire;
posed along the midrib. (T ab . XIX.)
of fructification linear, dis-
34. F avonia. (TaB. XCI.)
XVI. PADINA.
XVII. ZONAEIA.
35. c a lla r is ; procumbent, coriaceous, attached by the under surface; upper
surface emitting cup-shaped, membranaceous, orbicular fronds, fringed
round the margin. (T ab. CCCLIX.)
36. p a r ru la ; procmnbent, attached by fibres from the lower surface, membranaceous,
variously lobed; lobes free, rounded. (T ab . CCCXLI.)
XVIII. TAONIA.
37. a tom a ria ; frond broadly wedge-shaped, deeply and irregularly cleft longitudinally
; spores in wavy transverse lines, with intermediate scattered spores.
(T ab . I. Bktyota atomaria)
XIX. DICTYOTA.
38. d ichotoma; frond regularly dichotomous, the upper segments narrower.
(Tab. cm.)
XX. STILOPHOEA.
39. rh iz o d e s ; subsolid, much and iiTCgularly branched; the lesser divisions
dichotomous, attenuated; wart-like fructification densely covering the
branches and ramuli. (T ab . LXX.)
40. Lyngbysei; frond tubular, distended, dichotomous, with rounded axils,
much attenuated upwards; ramuli forked, capillary; sori subdistant, in
transverse lines. (T ab . CCXXXVII.)
XXI. DIOTYOSIPHON.
41. foenicnlaceus. (T ab . CCCXXVI.)