506 
Transactions of the Society. 
Earn. Nostoceae. 
Genus Nostoc Vauch. 
1. N. microscopicum Carm. III. M., Mp. Y. Go. 
Genus Anabsena Bory. 
1. A. inasqualis (Ktitz.) Born, et Flah. I. Ep. (spores up to 
5 -seriate). 
2. A. oscillarioides Bory. Y. Go. 
Genus Aplianizomenon Morren. 
1. A. flos-aquse (L.) Balfs. III. M. 
Genus Cylindrospermum Kiitz. 
1. G. stagnate (Kiitz.) Born, et Flab. III. Pu. 
Sub-ord. Homocyste^;. 
Fam. Camptotricheae. 
Ammatoidea gen. n. 
Plantae filamentosae et epiphyticae; fila longa e serie regular! 
singula cellularum formata, baud ramosa, prope medium subito et 
acute genuflexa circa ramos bospitis, extremitates ambas versus grada- 
tim et gradatim attenuata, flexuosa et vaginata ; vagina firm a, arcta, 
et lamellosa, acbroa vel luteo-fusca in partibus vetustis ; trichomata ad 
extremitates ambas in pilum longum attenuata, ad dissepimenta con- 
stricta ; cellulae subquadratae (vel diametro breviores) prope medium 
filamentorum, extremitates versus gradatim longiores (diametro usque 
ad 6-plo longiores) ; protoplasma aerugineum, granulosum ; fila secun- 
daria ubi genuflexa, in fibs primariis sedentes et iis similes. 
1. A. Normanii sp. unica. (PI. YII. figs. 25-28.) 
Character idem ac generis. 
Crass, fil. ad med. 5' 5-12 ‘5 fi; crass, tricb. 3 ‘5-5 5 ya. 
YII. Dartmoor (coll. T. Norman), epiphytic on Batrachosper- 
mum moniliforme. 
The long attenuation of both extremities of the filaments readily 
distinguishes this genus from all others and places this plant in the 
Camptotricheae. The filaments are very different from those of the 
only other genus ( Camptothrix ) of this order, and at first sight much 
resemble those of a Calothrix. The false ramification is most peculiar, 
the geniculate flexure of one filament being merely applied to the 
inner lamellae of the sheath of another, and included in the outer 
lamellae of the sheath. The plant is attached to its host by the 
medium acute flexure of the filaments around either one of the strands 
of the axis or one of the small lateral branches (vide fig. 25). 
