Both selaginella and salvinia produce different type of spores and this is the reason for seed habitat has female gametophyte is retained

Introduction:
In plants, spores are reproductive structures that are involved in the process of reproduction. They are usually single-celled and are capable of developing into a new individual under suitable conditions. Different plant species produce different types of spores, which can vary in terms of their size, shape, and reproductive function. In this case, we are considering four plant species - Equisetum, Salvinia, Selaginella, and both Salvinia and Selaginella.

Different Spores:

Equisetum:
Equisetum, commonly known as horsetail, is a genus of vascular plants that reproduce via spores. It produces two types of spores - microspores and megaspores. These spores are produced in specialized structures called sporangiophores. Microspores give rise to male gametophytes, which produce sperm, while megaspores give rise to female gametophytes, which produce eggs. This type of spore production is known as heterospory.

Salvinia:
Salvinia is a genus of floating aquatic ferns that also reproduce via spores. It produces only one type of spore known as homosporous spores. In homosporous plants, the spores are of the same size and shape and give rise to bisexual gametophytes. The bisexual gametophytes produce both male and female reproductive structures, allowing for self-fertilization.

Selaginella:
Selaginella, commonly known as spike moss, is a genus of vascular plants that also reproduce via spores. Similar to Equisetum, Selaginella produces two types of spores - microspores and megaspores. The microspores give rise to male gametophytes, while the megaspores give rise to female gametophytes. This type of spore production is also considered heterospory.

Conclusion:
Based on the given options, both Salvinia and Selaginella produce different types of spores. Salvinia produces homosporous spores, while Selaginella produces heterospores. Equisetum also produces different spores, but it is not listed as an option. Therefore, the correct answer is option 4) both 2 and 3 (Salvinia and Selaginella).