NOTES ON REGENERATION IN TUBULARIA CROCEA

Notes on Lactuca saligna in Iran

In the identification process of weed materials available in "IRAN" herbarium, a specimen belonging to the genus Lactuca (Asteraceae) had the following characteristics: Plant annual, many stemmed from base; stem erect-slightly procumbent, slender, glabrous, whitish and leafy. Basal leaves dried; stem leaves ca. 7 × 0.5 cm, glabrous, linear-lanceolate, entire at margin, sessile, auriculate, auri...

Chemotactic Turning Behaviour of Tubularia Spermatozoa

Chemotaxis of spermatozoa to female gonophores has been shown to occur in Campanularia, Tubularia and other hydroids (Miller, 1966 a, b). Cinemicrographic records of the movements of Campanularia spermatozoa in the vicinity of female gonophores or of glass capillary pipettes containing extracts of female hydranths have shown that chemotactic aggregation of the spermatozoa occurs because the spe...

Inhibition of pacemaker systems in the hydroid Tubularia.

A number of phenomena have been described in Cnidaria which indicate that inhibition is one of the factors controlling behaviour in these, the most simply organized living animals with indisputable nervous systems (Table 1). Although the presence of inhibition in a number of species of Cnidaria is well documented, in no case is the mechanism of inhibition understood. An example of inhibition wh...

The time course of pacemaker inhibition in the hydroid Tubularia.

NOTES ON SOME SPECIES OF THE GENUS EUPHORBIA IN IRAN

During the study on newly collected and herbarium specimens belonging to the genus Euphorbia, three species, namely, E. gorenfloti, E. cheirolepioides and E. splendida were found to be synonymous with E. chamaepeplus, E. grossheimii and E. decipiens, respectively. Euphorbia sahendi as an interesting and rare species has been recognized after long time again among my material and Euphorbia delto...