40 BRYOLOGY Of NEW ZEALAND. 
EXCLUDED SPECIES. 
cue pecan (R. Br. hae be Ind., p. 972 (Phascum lanceo- 
latum R. Br. ter. in Trans. N.Z. Inst., vol. 26, p. 302), and Pleuridium longi- 
rom A. austro-crispum. 
Drrricaum Timm, (Trichostomum Brid. p.p., Handb. N.Z, Fl., p. 416). 
Key TO THE Spectres (INCLUDING DisTICHIUM). 
L. Upper cells elongate, linear 
: we om 2 
Upper cells quadrate or r rounded, isodiametrical eg S. 5 
Sue hae ledsnssti is leavea somewhat distant, falcate-circinate, nev broad, 
. bli individes, 
bo 
Patron um ges short, or, if tall, leaves not circinate 
3 brevirostrum. 
Capsule inclined, more or less asymmetrical A 4 
— pred subulate, flexuose, silky, base of leaf and nerve pale 4, destolant 
¢. t, rather rigid, basal cells golden, nerve orange-red 5. calcareum. 
cla’ —— -eylindric, straight or curved, pale when ripe, not ptm 
(sm cylindric, straight or very slightly curved, lid very short, conical 
6. 
6. elongatum. 
Caps "elt or shortly eylindsio, usually straight, slightly narrowed at 
s distichous, Ss small, lid Hate conical .  Distich. capillacum 
ar not distichous, capsule longer, lid acutely rostrate es 
erates oblong, abruptly contracted above; cells at should aie A ae 
7. ue 3. punctulatum. 
|tatstns oval, more gradually narrowed above ; . " cells at shoulder short but 
t dense and opaque strictum. 
genus Ditrichum is a difficult one, not so much through any great 
variability in the plants themselves as because the specific differences are 
in many cases not of a very marked character. To aid the student in de- 
termining the species, I have—without attempting a full description in the 
case of the older species—added some notes on each which may prove of 
ere 
add to other difficulties, several of the Australasian species have been 
sdield misunderstood, as the synonymy indicates, and some of the problems 
have been somewhat difficult to unravel, and have seemed to require treating 
at some length. 
e distinction between the two forms of capsule on which the two 
subgenera Aschistodon and Euditrichum have been partly founded is not 
by any means so well defined as one would desire. Thus D. strictum, while 
having i capsule erect and symmetrical, = the arene generally very 
slightly narrowed, while small capsules of D. flexifolium may scarcely 
oahibit eed contraction, marked — as it is in the mt well-developed 
forms. The subgenera and Euditrichum, indeed, seem difficult 
to maintam. They are defined “a Brotherus thus :— 
Aschistodo le 
istodon Mont. Capsule symmetric, ayia: Peristome teeth 
short, undivided, hyaline. 
