140 GREENHOUSE FERNS. 



The veins of this fine Fern are very beautifully and regularly 

 arranged. The spore-masses are in rows on the upper part of 

 the frond. Rootstock creeping. Increased by division. 



DOODIA. 



D. lunulata, described among the Stove Ferns, will also 

 grow in the greenhouse. 



DOODIA CAUDATA (Tailed). This plant is too common to 

 need description. It generally comes up as a weed wherever 

 it can find an undisturbed place. The variety called con- 

 fluens is a very pretty form of the species, well adapted 

 for the Wardian case. In the barren fronds the divisions are 

 closer together than in the species ; and the fertile fronds are 

 narrow, linear, and wavy along the margin. 



DKYNAKIA. 



From drys, a tree : it lives in woods, and often grows on 

 the trunks of trees. This large genus has been formed out of 

 Polypodium. The distinguishing characters are the naked 

 spore-masses and the crooked veining. There are only two 

 greenhouse species. Sometimes called Phymatodes. 



DRYNARIA BILLARDIERI (Billardier's), Fig. 67. From Xew 

 Zealand and Van Diemen's Land. This Fern creeps so fast 

 that it is useful to cover naked damp walls, rockwork, or 

 stumps of trees, or to plant in rustic baskets ; in any of which 

 positions it will thrive well if frequently syringed. Fronds 

 simple and pinnated. Spore-masses large and round. In- 

 creased readily by division. 



D. PUSTULATA (Pimpled). From Xew Zealand. A very 

 dwarf Fern. Fronds from a few inches to a foot long, 

 simple occasionally ; pinnated veins, obscure and immersed. 

 Spore-masses round, and in one row or series. Increased by 

 division. 



