THE TASMANIAN FLORA. 



285 



2. P. TREMULA, R. Br. Tufted. Leaf erect, 1-4 feet, much divided,, delicate, 

 pale. P. arguta, Ait. 



Not common, but in numerous places in damp forests. Extra-tropical 

 Australia, and widely distributed in botli Hemispheres. 



8. LITOBROCHIA. 



Close to Peris, but at least som.e of the veins united, forming meshes, and the 

 sori interrupted. 



Pale green, creeping ... ... ... ... ... \. L. incisa. 



Tufted ... ... ... ... ... ... ... 2. L. comans. 



1. L. INCISA, Presl. Leaf 1-4 feet, pale green, glabrous, fleshy. Pinnules 

 usually entire, looping veins few. Stem creeping. Pteris incisa, Thun. 



Very common. Temperate climates in both Hemispheres. 



2. L. COMANS, PresL Leaves 1-3 feet, usually twice divided, rather dark 

 green. Ultimate pinnules serrate and attached by a very broad base, bases 

 blending, veins freely looping. Pteris cumans, Forst. Very like P. tremula in 

 general appearance. 



West and north-west. Eastern Australia to New Zealand. Polynesia and 

 .South America. 



9. ASPLBNIUM. 

 Sori oblong, linear, straight or nearly so, on a diverging vein, covered by 

 an indusium opening along the inner margin. 



i. Pinnules undivided . . 



Pinnules once to many times divided 

 ii. Pinnules 2-6 lines, as long as broad 



Pinnules 1-3 inches, longer than broad 

 iii. Leaves flaccid, apex filiform... 



Leaves erect, apex lobed 

 iv. Pinnules oblong, toothed, obtuse ... 



Pinnules narrow, oblong, toothed, acute 

 V. Ultimate pinnules fairly broad. Sori on the back 4. A. hulhiferum. 

 Ultimate pinnules narrow. Sori apparently 



marginal ■.■ -• •- .•• .-- ... 5. A. flaccidum. 



1. A. PLABELLifOLiuM, Cav. Leaves linear, pinnate, 6-18 inches, the apex for some 

 -distance filiform and without pinnae, rooting and viviparous at the end. Pinnules 

 rhomboid to obcuneate, rarely some of the lower ones divided, :^-| inch long. 



Very common in shelves of rocks. Extra-tropical Australia and New Zealand. 



2. A. TBiCHOMANES, L. Leaves linear, er6ct, pinnate, 3-6 inches, apex pinnate. 

 Pinnules rhomboid to semi-orbicular, J inch long. 



North, east, and west. Victoria, New South Wales to New Zealand. 

 Temperate Northern Hemisphere. 



3. A. OBTTJSATirM, Fovst. Leaves 3-18 inches, pinnate, erect or drooping. 

 Pinnules broad to narrow, oblong, obtuse and obtusely toothed, thick, 1-3 inches 

 long. A. marinum (partly). 



On sea-coasts. Bast Australia to New Zealand. 



A. LUCIDUM, Forst. A New Zealand plant, very similar to the above, but 

 of thinner consistency, larger pinnules, very finely toothed, and with 

 numerous very long and narrow sori, appears in some Tasmanian lists, 

 apparently by mistake. 



4. A. BiTLBiFEEU^M, Forst. In the typical form the leaf is tall, broad, twice 

 -divided, the secondary pinnules more or less deeply divided into obtuse teeth. 



IV. 



L. A.flabellifolium. 



2. A. trichomanes. 



3. A. obtusatum. 

 4<. A. hulhiferum. 



