2 REVUE BRYOLOGIQUE 
tome was very imperfectly developed. On tearing a portion of the. 
tuft to pieces I then discovered several plants of Weisia crispa 
Mit. imbedded in it and I think that there can be but little doubt 
that the capsules are the result of the fertilization of the arche- 
gones of the 7richostomum by the antherozoids of the Weisia and 
that T had before me another example of a hybrid moss capsule, 
of which the following is a description : 
_ Seta 2,80 to 3,15 mm, long, 11 to 44 mm, broad. Capsule ovate 
to ovate-cylindrival, brownish when mature, 2 to 2,15 mm, long 
with the lid, about 0,75 mm. broad:; lid very variable in length, 
0,35 to 0,84 long, straight or slightly beaked, cells straight or 
_ Slightly turned to the right; cells ofthe exothecium elongate, thin- 
walled, mostly rectangular 0,080 to 0,120 min. long, 0,024 to 0,040 
_ broad, threé or four rows of small, roundish, thicker-walled cells 
where the mouth should be, indehiscént except under pressure. 
_Stomäta few, large and indistinct at the base of the capsule about 
0,040 mm. long and 0.035 mm. broad, Columella rather large and 
_ thick, even when the capsule is mature, Peristomevery imperfect, 
_ consisting of a few, broken, highly papillose orange threads to 
about 0,16 mm. high. Spores 0,012 to 0,016 mm. rather irregular 
_ and papillose, not infrequently adhering together in the original 
_ letrads. Calÿptra brownish-yellow, long, up to 3,5 mm. and con- 
sequently extending far below the capsule. à 
The fact that the spores still occasionally adhere together in the 
__ original tetrads at mMmaturity, a condition altogether abnormal 
among the true mosses, may, Lthink, be regarded as addilional 
= evidence in favour of the hybrid origin of the capsules and {he 
large size of the calyptra which is, of course, a development of 
the vegetative plant of 7°. flavovirens and was intended for a 
= longer capsule points in the same direction. 
This is the third example from our Sussex downs, where the 
male plant of Weisia crispa has formed hybrid capsules with 
other mosses. In the other cases the female plants were Weisia 
crispata Lindb. (Rev. Bryol. 1905, p. 19 et seq.) and Weisia 
_ microsloma G. M, (Rev. Bryol, 1906, pp. 1-2). In the present case 
the aflinities between the two parents are more remote, but the 
facts, Ithink, help to strengthen the remarks of Venturi apropos 
Of à hybrid between Leptotrichum subulatum and Pleuridium 
subulatum (Rev. Bryol. 1881, P. 21), where he shows how such 
hybrids tend Lo prove the wholly artificial classification of the Mus. 
cleistocarpi, a classification still unfortunately relained in man 
Lewes, 214 Noveraber 1909. WE, NIGHoLSON.. 
