492 iv. MUSCJ. [Racopiluin . 
Northern Island: forests at Tehau-totara, etc., Cole/iso, Jollijfe. Chatham Island, 
W. Travers. 
71. HOOKEBJA, Smith. 
Monoecious or dioecious mosses. Stems prostrate or creeping, rarely sub- 
erect, variously branched, often pinnatelv ; branches usually compressed or 
quite flat. Leaves usually membranous, imbricate all round or distichous ; 
lateral often dissimilar, stipule-like and oblique; nerve 0 or 1-2; cells lax, 
rhomboid or hexagonal. Fruitstalk lateral, slender, often recurved at the top. 
Capsule ovoid, cernuous ; annulus obscure or 0; peristome double; outer of 
16 lanceolate-subulate incurved teeth, ribbed on the outer face, trabeculate 
on the inner; inner a membrane divided into 16 keeled teeth, with rarely 
interposed cilia ; operculum beaked. Calyptra mitriform, naked or fringed 
at the base. 
A large genus of tropical and temperate mosses, of which few species occur in the north 
temperate zone, but many in the south. 
§ I. Saui.ojia, Hook f. and Wils. Leaves subsecund, not margined; cells large, lax. 
Outer teeth remotely barred at the back ; inner keeled, without interposed cilia. Calyptra 
naked, indexed at the base, not fimbriate. 
Leaves oblong-ovate, acute, quite entire 1. H. tenella. 
§ II. Mniadelphus, C.Muell. Leaves margined or not; nerve 0 or vanishing. Inner 
teeth of peristome without interposed cilia. Calyptra fimbriate at the base ( Distichophyllum , 
Dozy and Molkb.). 
a. Leaves with thickened margins. 
* Leaves serrulate ; nerve 0 or reaching halfway. 
Leaves orbicular-obovate ; cells large, lax ; nerve 0 2. H. apiculata. 
Leaves orbicular-ovate ; cells large, lax ; nerve reaching halfway . 3. H. rot undifolia. 
** Leaves quite entire ; nerve reaching halfway. 
Leaves green, obovate or oblong ; cells small ; perichsetial acumi- 
nate 4. H. crispula. 
Leaves white, obovate, apiculate ; cells small ; perichsctial obtuse . 5. H. pulcliella. 
Leaves yellowish, obovate, apiculate, crisped when dry ; perichaetial 
obtuse 6 . H. sinuosa. 
Leaves yellow-green, obovate, not apiculate ; margin reflexed ; pe- 
richeetial obtuse 7 . H. amblyophylla. 
Leaves yellow, oblong, acute, filmy ; perichsetial acute . ... 8. H. adnata. 
Leaves obovate-spathulate, apiculate, opaque ; perichectial ovate, 
acute 9. H. flexuosa. 
0. Leaves without thickened margins. 
Leaves obovate, obtuse 10. H. microcarpa. 
§ III. Pterygophyllum, Bridel. Leaves flattened, not margined, toothed; nerve short, 
2-fid ; cells large, lax. Eruitstalk glabrous. Outer teeth remotely barred. Calyptra .not 
fimbriate at the base, often laciniate. (The species of this section are probably all forms of one.) 
Stems 2-10 in. long. Leaves pale green, obovate or rhomboid . 11. H . quadrifaria. 
Stems 5-1 in. long. Leaves blackish, oblong-ovate or obovate . 12. H. denticulata. 
Stems 1-4 in. long. Leaves pale green, ovate-oblong . . . .13 ■ H. robusta. 
Stems 5-1 i i. long. Leaves brown or blackish and spathulate . 13. H. nigella. 
§ IV. Eriopus, Bridel. Leaves flattened, scarcely margined, serrate; nerves 2, short; 
cells large, lax. Fruitstalk crested above with long hairs. Outer teeth trabeculate; inner 
with interposed cilia. Calyptra fimbriate at the base, papillose at the apex. 
