COLLECTED DURING THE c CHALLENGER ' EXPEDITION. 61 



RlIACOPILUM TOMENTOSUM, Brid. 



In very small quantity, with fruit. 



ISOPTERYGIUM TEXERUM, Sw. 



In fruit. 



Cephalozia conxivens (Dicks.). 



Fragments with Aneura palmata. 



Pleuroschisma prostrata, Sw. 

 Aneura palmata (Hedw.). 



Without fructification. 



Otiona Aitonia (Nees ab £.). 



Barren. 



Dumortiera hirsuta (Sw.). 



Fertile. 



Tristan d'Acunha. 



Cynontodium conicum (Mont.). 



Tall stems, without fruit, appearing to be the same as the 

 Chilian species. 



Campylopus introflexus (Hedw.). 



Fertile, in a very small and short state, growing on the earth. 



C. arcuatus, Brid. 



Barren, with a tall state of the preceding associated with Bar- 

 tramice ; in coarse sand. 



Ceratodon purpureas (Linn.). 

 One or two fertile stems amongst Marchantia. 



Grimmia (Dryptodon) membranacea, Mitt. 



Compacte csespitosa. Folia sicca arete appressa, humida patentia, lan- 

 ceolata ovato-lanceolataque sensim acuta, apicibus saepe brevissime 

 hyalinis, margine recurva, nervo canahculato in apicem evanescente 

 carinata, cellulis parietibus ubique interruptis areolata ; perichaetialia 

 dimidio breviora ovata obtuse acuta. Theca in pedunculo brevi ovalis 

 operculo subulato, peristomio pallido, annulo composito. 



On rocks. 



Caulis uncialis ramosus. Folia juniora viridia, seniora fuscata. Pedun- 



culus sesquilinearis pallidus. Theca evacua brevior ovalis pallide 



fusca membranacea. 



Similar to G. symphyodon, C. Miiller, but with the leaves at the 

 apex not contracted into an apiculus. 



