3. Iso th ec ium pumilum (Hook. fil. et Wils.) ; dioicum, caule dendroideo pinnatim ramoso inferne
squamoso, ramis complanatis, foliis quadrifariis ovatis vel oblongo-ovatis serrulatis nervo tenui ultra medio,
perichætialibus subsquarrosis ovato-ligulatis, seta breviuscula, lævi, capsula ovata cernua anuulata, operculo
rostrato.—Neckera (Thamoium) rivalis, Mitten, in Journ. Linn. Soc. ined. (Tab. CLXXV. Fig. 7.)
H a b . On rocks. {Gunn.) On stones and rocks; copse. West End Eivulet and Stackhouse Falls,
Cheshunt, Archer.
Thrice as small as I. pandum, Hook. fil. et Wils. Fl. N. Zeal. p. 105. t. 89. f. 1.—Leaves more evidently serrate,
with a short, very faint nerve. Stem 1 iuch. Sela scarcely i inch. Operculum as long as the capsule. Feristome
double; outer teeth pale yeUow.—P la t e CLXXV. Fig. 7; 1, part of stem and leaves ; 2, leaf; 3, perichætium
and capsule, etc. :—all magnified.
§ 2. Hypnodendron.—Rami in frondem korizontalem deltoideo-subrotundam dispositi. Innovationes e
basi f rondis orti. Capsula striata.
4. Iso th ec ium spininervivun {Hypnum, Hook. Muse. Exot. t. 2 9 ); dioicum, comosum, ramis
simplicibus complanatis, foliis appresso-patulis siibdistiche imbricatis ovatis acutis margine dorsoque serratis
solidinerviis, capsula oblonga sulcata cernua, operculo rostrato capsula breviore.— Schwægr. Suppl.
t. 258. Trachyloma arcuatnm, Milten, in Journ. Linn. Soe. ined.
H a b . In woods, rare. Back River Gully, New Norfolk. {Gunn) { J .D .H ) {Oldfield, Zb.) On
the ground, and on stones in the bed of rivulets ; Cheshunt, Archer.
D is t r ib . New Zealand, Australia.
5. Isoth ec ium A r ch eri (Mitten) ; "dioicum, ramis erectis inferne simplicibus sparse foliosis superne
pulchre. pinnatis plumiformibus, ramulis patentibus distichis in frondem brevem subtriangularem dispositis.
foliis bifarie compressis ovato-lanceolatis acutis nervo percurrente, dorso apice denticulato, marginibus sim-
pliciter serratis, cellulis longitudine circiter latitudine une. metientibus dorso minute papilloso-
punctatis, seriebus foliorum in latere dorsali minoribus sed conformibus, perichætialibus e basi late ovata
tenui acuminatis erectis, theca in pedúnculo vix unciali horizontalis oblonga sulcata, operculo longi-curvi-
rostrato, peristomio normale.”—Trachyloma Archeri, Mitten, in Journ. Linn. Soc. ined. ( T a b CLXXV
Pig. 8 .)
H a b . Ovens Creek, Cheshunt, Archer.
Two or three inches in height, pale yellowish-green, shining. Nearly aUied to II. arcuatum, Hedw., but its
Ijranches are more regularly disposed, forming a subtriangular frond, and readily distinguished by its minutely
dotted leaves and short capsule. Mitten, /.c.—P l a t e CLXXV. Fig. 8 ; 1, leaf; 2, ditto of perichætium; 3, capsule
;—all magnified.
6 . Isothec ium comosum (Labill. PI. Nov. Holl. ii. 107. t. 253. Î. 2) ; dioicum, dense cæspitosum,
caule tomentoso apice comoso, ramis subverticillatis brevibus densis suberectis, foliis patentibus subsecundis
rigidis e basi subauriculata ovato-lanceolata subito acuminatis apice serrulatis nervo crasso solido tereti
dorso lævi excurrente setaceis, perichætialibus longioribus erectis, capsula in pedúnculo mediocri pendula
oblonga sulcata, operculo longirostri.—Rrf/e/, Bryol. Univ. ii. 374. Hypnum comosum, Schwoegr. Suppl.
t. 91.
H a b . Tasmania. (Barren specimens only.) {Gunn.)
D is t r ib . New Zealand, Lord Auckland’s Islands.
7. Isothec ium S ieb e r i {Hypnum., C. Mueller, Muse. Syn. ii. 604); dioicum, laxe cæspitosum,
caule robusto tomentoso apice lateraliter (nec verticillatim) comoso, ramis crassis curvatis cirrhatis apice
subcuspidatis, foliis erecto-patentibus confertis anguste lanceolatis seusim acuminatis superne grosse serratis
nervo valido concolore excurrente (acumen haud omnino occupante) carinatis margine subincrassatis, setis
aggregatis mediocribus tortis, capsula horizontali sulcata, operculo longirostri.—Trachyloma comosum,
Mitten, in Journ. Linn. Soo. ined.
H a b . Woods on Mount Wellingtou. (/. D. I I ) {Oldfield, 64, 108.) River Acheron, Gunn, 1593.
Cheshunt, Archer.
D is t u ib . New Zealand and Lord Auckland’s Islands.
Leaves longer than in I. comosum, more crowded, with large senatures and areolæ, more distinctly striated
when dry ; nerve less solid, not cylindilcal, but keeled at the back. Branches longer, deflexed. Habit more robust.
Colour greenish, not fulvous.
8 . Isoth ec ium C o len so i (Hook. fil. et Wils.) ; dioicum, laxe cæspitosum, caule breviusculo tomentoso
apice lateraliter pinnatim comoso, ramis breviusculis decurvatis, foliis laxiuscule patentibus subsecundis
rigidiusculis e basi cordato-lanceolata setaceo-acuminatis apice argute serratis nervo crassiusculo inferne
dorso punctulata apice argute spinuloso excurrente, seta prælonga, capsula subpendula elongate cylindrica
curvula octosulcata, operculo longii-ostri.— I. comosum. Hook. fil. et Wils. Fl. N . Zeal. 106, ex parte.
(Ta b . CLXXVI. Fig. 1.)
FIab. Tasmania. (Barren specimens only.) {Gunn.)
D i s t r ib . New Zealand.
Overlooked as a variety of I. comosum in the ‘ Flora of New Zealand,’ but on examination it appeal's to be quite
distinct. It diflevs from both of the preceding species in the elongated capsule and seta, and from Rypnum comatum,
0. Mueller, Syn. Muse. ii. 692, iu the more strongly and sharply serrated ajiex of the leaf, which has the nerve
constantly punctulate at the back, more solid at the excurrent apex, where it is cylindrical and spinulose.— Areolæ
of the leaf wider ; alar cellules oval-oblong, numerous, not coloured. Colour of the foliage deeper green. Stem
shorter than in I. Sieberi. Branches few, scarcely i inch long, not attenuated, more rigid, uot whoried, but forming
a lateral frond. Capsule (with the operculum) about F ineh long. Teeth of the peristome pale yellow.
“ This appears to me to be the H. comatum, C. Mueller.” Mitlen, in Ut.—P la te CLXXVI. Fig. 1 ; 1, leaf;
2, capsule:—both magnijied.
Tribe X X III. Hypnaceæ.
Gen. LV. HYPNUM, Linn.
Peristomium duplex; externum, dentes 16, lanceolati, reflexiles, intus trabeculati, linea media notati;
internum, membrana carinato-sulcata iu processus 16 carinatos ciliis interpositis mediotenus fissa. Calyptra
cuculliformis, glabra. Capsula inæqualis, arcuata, cernua, plerumque anuulata, longe pedicellata.— Habitus
varius. Caulis plerumque repens, vage vel pinnatim ramosus.
§ 1. Tamauiscina.—Caule pinnatim ramoso, stupa viridi e fibris ramosis composita villoso.
1. Hypnum læviusculum (Mitten) ; “ dioicum, II. tamariscino simillimum, caule folioHs brevibus
dense vestito, foliis ejusdem latitudiiiis subæquilatcri triangularibus nervo crasso concolori iu acumen
angustum elongatum flexuosum excurrente, marginibus infenie recurvis integerrimis cellulis minutis sub-
obscuris læviusculis, rameis basi ovatis acuminatis obtusiusculis concavis ramulinisque ovato-oblongis compressis
obtusis obscuris subintegerrimis minutissime papillosis sublævibus, perichætialibus erectis pallidis
ovato-lanceolatis in acumen elongatum flexuosum subserrulatum attenuatis, margine apicem versus partis
latioris ciliato, theca iu pedúnculo elongato rubro cylindrica arcuata horizontalis peristomio normale.”—•
Leskea læviuscula, Mitlen, in Journ. Linn. Soc. ined.