238 GLOSSOPTERIS AND ITS ALLIES, 



round serially arranged sori, leaving those with the fructification 

 placed in a linear manner along the secondary nerves, and typified 

 by the Glossopteris described by Mr. Carruthers from Queensland, 

 as the type of a new genus, should researches in the future furnish 

 additional examples with similar structure. Again referring to a 

 tabular form the classification will stand thus : — 



Group 1. — Glossopteris, Brongniart. Type, G. hroivniana var. 

 indica, Brong. (G. indica, auct.). Sori round, sessile, subserial, 

 near the margin of the frond. 



India and Australia. 



Group 2. — 1 . Type, G. hrowniana, Carruthers (non Brong.). 

 Sori linear, sessile, along the secondary veins (and nervules ?). 



Australia (Queensland). 



Group 3. — % . Type, G. angustifolia, Feistmantel (1 G. angus- 

 tifolia, Brong.). Fructification marginal, on a clear space along 

 the margins of the fronds. 



India. 



With regard to that large body of leaves described under 

 various names, and without evidence of fructification, it will be 

 convenient to write them as Glossopteris, followed by a note of 

 interrogation, until their true , affinity shall become known. 

 Amongst these will naturally fall the specimen from near Mudgee 

 described in this paper, 



4. Relation of the Mudgee Specimen to Glossopteris (Auct.) 



We may now perhaps profitably engage ourselves with the con- 

 sideration of how far the Mudgee sjjecimeu (PI. xviii. fig. 1, PI. xix. 

 fig. 1) corresponds in structure with that of Glossopteris, as 

 generally understood. On comparison with Dana's remarkable 

 figure we have to note the petiolate leaves of the latter, and their 

 apparently sessile condition in the former. All forms of Glossop- 

 teris are petiolate, in a greater or less degree, generally the former, 

 and many highly so. That the fronds in Dana's illustration are 



