BOTANICAL SUBJECTS. 281 



containing spermatozoids, and also ordinary hairs, which may be 

 considered as abortive male organs.* 



Here it may be noted that Selaginella inequalifclia^ has its 

 most important organ — the sporangium — unfed by direct fihro- 

 vascular tissue. The latter branches off from the stem to the 

 leaf, leaving the sporangium to one side, and only connected witli 

 the rest by simple cellular tissue. It is a reproductive hair to all 

 intents and purposes. 



It should be here also noted that both the male and female 

 sporangia of this Selaginella"]; are nothing but axillary buds and 

 branchlets of the leaf, the ligule being only a bud-scale. 



Glandular Hairs. 



If we take up a branch of the moss-rose and examine it with a 

 lens, we see what are called branched glandular hairs. They cover 

 the bark, the petioles, the nerves, the veins, and letif margins. 

 What legitimate inference might one draw from this fact ? At all 

 events, the inference that I drew was that all these parts, including 

 the margins of the leaflets, were only sub-divisions of the stem, 

 and that, in the leaflets, the parenchyma fasciated these sub-divisions 

 for the purpose of facilitating circulation, aeration, and illumina- 

 tion of the plant blood. 



I also came to the conclusion that glandular hairs are the 

 remnants of the reproductive organs, which still exist on the 

 stem of Cymopolia barbata (Fig. 124), a calcareous Alga. 



In most roses, for instance, on the margins of their young 

 leaves and bud-scales, we find glandular hairs, and also teeth 

 surmounted with the same gland as that of glandular hairs. We 

 then find these glands changing their character on the teeth of the 

 fully formed leaves. The tooth becomes tipped with a red conical 

 point, not pin-headed, as in the glandular hairs. It is only now 

 and again that you see a minor tooth tipped with a pin-head. 



* vSiuce writing the foregoing I find that F. O. Bower ("Practical 

 Botany," p. 402), writing of oogonia of Fucus serratus, which oogouia I take 

 to correspond to ovules, says, "each of these is seated on a unicellular 

 pedicel, and may be regarded as a metamorphosed hair." 



t Goebel's "OutUnes of Classif.," p. 297. 



+ n '>Q'> 



