The Dianic Tradition has two different branchs and even though they have been created more or less in the same time and have practices, rites, philosophy and very similar thealogia, the Tradictions were idealized by different people.
In 1974 Zsuzsanna Budapest founded her own Coven, with three friends. She gave the name Dianic to her Tradition, for emphasizing the Goddess and the woman in their rites and myths with a monotheistic worship dedicated to the Sacred Feminine, without recognizing the Horned God. Later the Tradition created by Budapest became known as Feminist Dianic for their rites and myths focus exclusively the Goddess and for only women's participation in their Covens and groups. The members of this Dianic branch are politically a feminist group, having a strong lesbian presence in the movement, although most of Dianic Feminists Coven are open to women of all orientations.
Most Dianic Feminist Witches are women that choose not to work with masculine energy in their rituals. They feel that they need spiritual and psychic space filled only with feminine energy.
Dianics of this branch frequently see the Craft by a feminist focus. All of them agree that the religions nowdays emphasized the masculine too much during the last thousand years and for that restore the preponderance of the Goddess in their practices is indispensable. Usually the Feminist Dianics don't worship any masculine God.
Approximately the same time, Morgan McFarland founded her own Tradition. Inspired for the references found in Margaret Murray's books, that affirmed the old European religion was a " Diana Worship", she decided give the name Dianic to her Tradition, that passed to be called alternatively as Old Dianic and later in 1999 became McFarland Dianics.
Was the desire to affirm a Feminine spiritual base that guide Morgan McFarland and Mark Roberts make available, to a growing number of interested people, a series of lessons and exercises on the Old Religion. Their Coven grew and formed many Covens in the area of Dallas, with courses that were sent even by correspondence. There is some descending Covens of this Tradition especially in Texas and other similar Covens in thealogia(Thea = Goddess), but that don't descend directly from McFarland lineage and that are spreade around USA.
This Dianic branch gives supremacy to the Goddess thealogia, but honors the Horned God as Her beloved and blessed Consort. The Covens' members are men and women.
The conviction in the "essence" distinguishes the Old Dianic Tradition from other Pagan paths, with the focus in the Immortal Goddess and in the 3 Goddes faces : Maiden, Mother and Crone. The Horned God is Her son and Consort and is the Mortal principle that exists in relation to the Goddess, being loved and reverenced with kindness by their members. In this Dianic path, men are wellcome and they become Conven members. The Priestess represents the Goddess and the Priest represents the God, differing little from other Traditions.
With these two different Dianic branchs, appeared Priests and Priestess that trained others and many groups inspired by their several combinations of ideas and practices did arise, originating countless variations of Dianism today all over the world.
In spite of some Witches use the term Dianic to denote that they are "Diana's Daughters", the Goddess that some of them choose as her personal and protecting Deity, the Dianic Tradition is open to the all mythological panteons in agreement with the personal taste of each group. The term Dianic is used just because Diana choose doesn't unite herself with any masculine God and became breed and virgin, without a masculine companion.
Some Dianics worship Celtic Gods and others Nordics, Mesopothamics and Egyptians. The worship to a specific pantheon is a personal choice of each group or Tradition expression.
We can see that the concepts and practices vary a lot in the Dianic Tradition, as well as in any other. So, what was exposed here is a generic reference on this Pagan path. There are Dianic Witches that are all that, some nothing of that and others that are a mix of that.