OF T1IE ATLANTIC ISLANDS. 3 



not hygroscopic; and BrachysteJeum of Homsclmch (an older 

 name applied to the same species) he is willing to retain for the 

 reception of such species as have a short seta ; but these are all 

 the distinctions upon the strength of which they are to be consi- 

 dered coequal genera with Glyphomitrium. 



Brachyodus, Nees et Hornschuch, and Campylostcleum, Bruch 

 et Schimper, owe their distinction from Glyphomitrium chiefly to 

 their diminutive size ; besides which, the only characters in Bra- 

 chyodus are the short peristome and the plication of the empty 

 capsule, and in Campylosteleum the curved fruitstalk ; for in the 

 latter the peristome is similar to that of Ptychomitrium. All the 

 species of these supposed genera agree in the areolation of their 

 leaves, the mitriform calyptra, and in having a peristome which 

 among them passes through similar forms to those observable in 

 Grimmia, to which they appear to form an allied and closely related 

 genus — differing in habit and areolation, but agreeing in the struc- 

 ture of the peristome, the highest development of which appears 

 in Glyphomitrium polyphyllum and Grimmia (Rhacomitrium) ca- 

 ?icscens, Dill. 



Ulota, Brid. 

 U. vittata, sp. nov. Habitu staturaque U. Bruchii, foliis patentibus 

 siccitate crispatis e basi latiore subovata sensim lineari-lanceolatis apice 

 obtusiusculis nervo carinatis integerrimis, cellulis basi ad latera seriebus 

 singulis hyalinis quadratis interioribus ad nervuin elongatis angustis, 

 ad margines usque ad folii medium seriebus circiter sex cellularum 

 elongatarum angustarum vittam plus minus distinctam formantibus, 

 theca ovali sensim in pedunculum attenuata siccitate plicata rubro- 

 fusca, peristomio U. Bruchii, calyptra ramentis paucis brevibus ap- 

 pressis. 

 Hab. Madeira, on trees on the mountains, Johnson. 



Different from U. crispa, Hedw., and JJ. Bruchii, Hsch., in its 

 calyptra and in the presence of the bands of elongated cells, which 

 are not truly marginal, for a single row of rounded cells forms the 

 margin ; this vittation is not uniformly evident in every leaf, but 

 is generally so. The rounded cells of the upper part of the leaf 

 are about half the size of those of V. crispa. 



Brtum, Dill. 

 B. Notarisii, sp. nov. Dioicum, dense caespitosum, nitidum, foliis 

 confertis patentibus ovato-lanceolatis apice latiusculo apiculo parvo 

 sensim acuminatisve nervo crassiusculo in mucronem excurrente, mar- 

 gine superne parce denticulato medio recurvo, cellulis basi quadratis 

 oblongis deinde longioiibus prosenchymaticis, perichsetialibus basi 



b2 



