452 INTRODUCTION TO CETPTOGAMIC BOTANY. 



5. HAPLOLJBNEiB, Nees. 



Involucre monophyllous when present, jagged ; perianth 

 none ; sporangium sphaerical; elaters bispiral, seated near the 

 base, and deciduous, or attached to the apices of the valves ; 

 fronds dichotomous, ribbed, or with the rib confluent with the 

 margin. 



495. This tribe consists of three genera, of which Blasia and 

 Pellia contain common European forms, while Symphyogyna, 

 though extending to Australia and New Zealand, is entirely 

 extra-European. Pellia epiphylla, which affects the same 

 situations as Aneura, is known by its dorsal fruit, and globose 

 sporangia, the elaters of which do not adhere to the tips of the 

 valves. Blasia has scarcely any involucre, and is remarkable 

 for the flask-shaped bodies which contain the gems, and which 

 may easily be taken for fruit. Symphyogyna (Fig. 95, a, h) 

 contains many very beautiful forms, some of which are erect 

 and stipitate, from a creeping rhizoma, and appear like little 

 Hymenophylla. In this genus the valves of the sporangium 

 often adhere together above, like those of Androia. S.rhizobola 

 has a strongly nerved frond, with a thick serrated margin, and 

 often ends in a filiform rooting process like the stem. The 

 involucre in Symphyogyna consists of a single scale. The 

 archegonium after impregnation extends downwards into 

 the torus, so that when it is fully developed, and the spo- 

 rangium bursts out, it is studded above with the abortive 

 archegonia. New Zealand produces five species, two or three 

 are found in New Holland and Tasmania, and one doubtful 

 species in North America. 



6. DiPLOMiTElEiE, Nees. 



DiPLOLiENE.ffi;, Dum. 



Involucre monophyllous, at first terminal, arising from the 

 midrib, ventral or dorsal ; perianth tubular ; sporangium oval 

 or oblong ; elaters deciduous, frondose, costate. 



496. This tribe contains but a single genus, Blyttia (Fig. 

 95, c), which is represented in Europe by two species, of which 

 one, B. Lyellii, occurs in almost all parts of the world. Three 

 species are found in New Zealand, one at Cape Horn, and one 



