Hyphae and Mycelium
ஹைஃபா மற்றும் மைசீலியம்
Do not confuse hyphae with simple filaments. In NEET, the distinction between coenocytic and septate hyphae is a high-yield discriminator. If you miss the multinucleated nature of the former, you lose the question.
The idea
Fungi exhibit a body composed of long, slender, thread-like structures called hyphae. A complex network of these hyphae is termed mycelium. Hyphae are classified as coenocytic when they exist as continuous tubes filled with multinucleated cytoplasm. Alternatively, they contain septae or cross-walls, dividing the cytoplasm into distinct cellular compartments.
Why it matters
This filamentous structure provides a high surface-area-to-volume ratio, which is essential for the efficient absorption of nutrients from the substrate.
NEET lens
NEET examiners frequently test the term 'coenocytic' in the context of Phycomycetes. Memorize that coenocytic hyphae lack septae. Expect matching-type questions comparing hyphal structure with fungal classes. Focus on the structural difference between continuous tubes and septated filaments.
Clinical significance
Pathogenic fungi like Aspergillus and Candida utilize these hyphal structures to penetrate human tissues. Mycelial growth allows these fungi to invade host cells, causing invasive mycoses. Without these structures, the fungi would lack the mechanical strength to breach epithelial barriers.
Introduction
A mushroom is not the fungus — it is the fruiting body. The actual organism is an invisible network of threads running through the soil or decomposing wood: the mycelium. Most of the fungal kingdom is underground, unseen, and overlooked.
Core concept
Hyphae (singular: hypha) are tubular, thread-like filaments with chitin cell walls. Two types:Septate hyphae — cross-walls (septa) divide them into compartments; found in Ascomycetes and BasidiomycetesAseptate (coenocytic) hyphae — no cross-walls; multinucleate continuous cytoplasm; found in Phycomycetes (Mucor, Rhizopus)Mycelium is the mass of branching, interwoven hyphae that forms the vegetative body of the fungus — responsible for nutrient absorption.
Go deeper
Specialised hyphae: rhizoids (anchor to substrate, as in Rhizopus), haustoria (penetrate host cells in parasitic fungi), stolons (horizontal hyphae connecting rhizoid groups). These terms appear in NEET questions on specific fungi.
From Class 10
In Class 10, you saw thread-like structures on mouldy bread without knowing their name. In Class 11, those threads are hyphae — and their collective network is the mycelium. Understanding hyphae and mycelium is understanding the fundamental body plan of Kingdom Fungi.