1 Pilularia. MARSILIACEAE. 43 



4. M. hirsuta, R. Br. Leaflets obovate-oblong, usually small, hairy when young, but 

 soon becoming glabrous ; sporocarps small, almost globular, smooth, hairy, sessile or 

 nearly so. 



Marshy ground, Pinnaroo. 



2. PILULARIA, L. 



(Latin pilula, a pill : alluding to the shape of the fruits.) 

 1. P. Novae Hollandiae, A. Br. Pillwart. Rootstock creeping under water ; barren 

 leaves clustered, filiform, 3-10 cm. long ; sporocarps globular, 3-4 mm. diameter, pubescent, 

 stalked, 4-celled, each cell enclosing male and female spore-cases ; fruit-stalk forming a 

 rhaphe along the sporocarp ; macrospores not contracted above the middle. — P. globu- 

 lifera, Benth. not of L. 



Recorded by Tate for his District S (Lake Torrens to Lake Frome) ; I do not know on 

 what authority. 



Family 8.— SALVINIACEAE. 



Spores of 2 kinds, as in Marsiliaceae, bat each sporocarp contains spore-cases of one 

 sex only. Small annual floating plants. 



1. AZOLLA, Lamk. 

 (Greek a, without ; zoe, life : because the plants are killed by any drought.) 

 Sporocarps globular, 1 -celled, membranous, usually in pairs at the base of the lower 

 branches, one containing a single macrosporangium and the other containing many 

 pedicellate microsporangia ; leaves small, fleshy, sessile, alternate, closely imbricate in 

 2 rows ; stems branching and rooting. Small floating plants, usually collected in masses 

 on the surface of the water. 



Stems deltoid in outline, regularly pinnate A. pinnata 1. 



Stems obovate in outline A. filicdloides 2. 



1. A. pinnata, R. Br. Rootlets tending to become feathery ; stems pinnate or bipinnate, 

 the leafy branches spreading regularly and becoming shorter towards the summit of the 

 stem or pinna, so as to give it a somewhat deltoid outline ; larger sporocarps reddish. 



River Murray, Jan. -May. 



2. A. filiculoides, L. var. rubra (R. Br.) Diels. Whole plant reddish, compact ; roots 

 simple, stems rounded in outline, the branches shorter and broader than in the preceding. — 

 A. rubra, R. Br. 



River Murray, Jan. -May. v , 



Class LYCOPODIALES. 



The embryonal generation either homosporous (Lycopodiaceae), or heterosporous, with 

 macrosporangia and microsporangia (Selaginellaceae and Isoetaceae) ; leaves always 

 minute or very narrow. 



Family 9.— LYCOPODIACEAE. 



Spore-cases solitary in the axils of the leaves or bracts of a terminal spike, 2-valved ; 

 spores all of one kind. Perennials, with small simple leaves without ligules. 

 Leaves spirally imbricate along the stems and branches . . . Lycopodium 1. 

 Leaves radical, linear Phylloglossum 2. 



1. LYCOPODIUM (Rupp.), L. 

 (Greek lykos, wolf ; podion, little foot : resemblance of the leaves to claws.) 

 Spore-cases compressed, often ren'iorm, opening by a transverse slit, singly sessile in 

 the axils of the upper leaves, or of bracts (altered leaves), and forming spikes ; leaves 

 small, 1 -nerved, densely crowded all round the stem and branches. Clubmoss. 

 Spikes terminal. 



Spikes on divided branches L. densum. 1. 



Spikes on simple branches L. carolinianum 2. 



Spikes lateral L. laterale 3. 



1. L. densum, Labill. Stems creeping underground sending up erect branches which 

 are stemlike in the lower part and dichotomously branched above ; leaves lanceolate, 

 those of the stem and lower part of the branch appressed and 3-4 mm. long, those of the 

 branchlets spreading-erect and 2-3 mm. long ; fruiting spikes terminal, erect, l-2£ cm. 

 long ; bracts ovate -lanceolate with spreading tips. 

 Near Mount Lofty. 



