skip to Main Content

Rhizomorphic vs Tomentose Mycelium: Is Fluffy Growth Better?

Rhizomorphic Vs Tomentose_Is Fluffy Mycelium Better Than Stringlike_Curative Mushrooms

Rhizomorphic vs. Tomentose Mycelium (a.k.a. string-like Mycelium vs. fluffy white Mycelium) is like a battle between a healthy and a moldy grow kit.

If you go to Reddit forums, you will mostly see growers still arguing about which growth type is better.

But is there really a preferred type of mycelium growth? Can a substrate have both kinds of mycelium growth? Will rhizomorphic Mycelium turn tomentose?

tomentose mycelium_Tomentose vs Rhizomorphic_Curative Mushrooms

Below, we will show you the difference between the two. Then, we will decide if tomentose growth is better.

1. Tomentose fluffy Mycelium

tomentose fluffy mycelium_Tomentose vs Rhizomorphic_Curative Mushrooms

Tomentose growth appears cottony, fuzzy, or matted.
Two probable reasons for this appearance are:
  • It has many genetic strains.
  • Hyphal strands of Mycelium do not spread enough to seek nutrients from the substrate, so they grow so close.

2. Rhizomorphic string-like Mycelium

rhizomorphic mycelium_Tomentose vs Rhizomorphic_Curative Mushrooms

Rhizomorphic Mycelium has the appearance of a defined network of strings or threads.
Such growth may result from:
  • only one or a few genetic strains
  • the substrate that is not nutrient-dense.
“Wait! In the first place, I do not know what Mycelium is.”

What is Mycelium in Fungi & Mushrooms | Mycelium Network
The terms may be confusing for newbie mushroom growers. To answer that, we made another article explaining what Mycelium is and its functions.

3.1. Can you have both Rhizomorphic and Tomentose growth?

tomentose and rhizomorphic mycelium in one_Curative Mushrooms

If you grow from mushroom spores, you might notice different substrate areas with string-like and fluffy growth. Contrasting regions of your medium or substrate are called sectors.

Spores may have multiple gene expressions on the substrate, which results in sectoring. When you grow directly from spores to substrate, the type of mycelium growth can be hit and miss.

Mycology can get pretty deep, but the answer is yes; both types of growth may occur in one medium or substrate.

How To Grow Mushrooms From Spores, Culture or Spawn_Process Explained_Curative Mushrooms
It’s practical to test out your spores first. Inject the spores in a small rye bag, jar, or agar dish. In that way, you do not waste your grow bag if your spores end up non-sterile or viable.

Sometimes, it is not Mycelium but mold.

3.2. Will Tomentose (fluffy Mycelium) turn Rhizomorphic?

tomentose turning rhizomorphic_Curative Mushrooms

Let’s take, for example, a grower using an agar dish and grain jar. Both stayed in the tomentose phase while on agar and in grain.

Yet, for some reason, when he spawned them onto the tub, the Mycelium turned rhizomorphic. The tub grew healthy mushroom flushes.

Mycelium will display diverse forms on nutrient agar and will constantly evolve. So Rhizomorphic mycelium can turn Tomentose.

3.3. How to encourage Rhizomorphic growth?

Fluffy mycelium growth is encouraged by broken grains or kernels (a consequence of excessive water). Thus, to promote string-like growth, you need to reduce moisture in your substrate.

Another critical factor is the pH level. The string-like growth is encouraged by substrate at a 6.5 pH level. To maintain a 6.5 pH, growers often use a combination of chalk and gypsum.

Finally, let us decide: Rhizomorphic vs. Tomentose Mycelium. Which is better?

is rhizomorphic better than tomentose_Curative Mushrooms

Mostly, you have asked around online forums and groups.

You have probably read narratives of experienced mushroom growers getting better flushes from rhizomorphic Mycelium. String-like Mycelium is correlated to fast mycelium growth and forming of primordia.

grow kit banner ad blog

Also, when growing from an agar plate, growers suggest cutting out the rhizomorphic thread-like Mycelium. This isolate can be used for your big substrate.

However, even if your Mycelium is tomentose, it does not mean “toss the Tose!” You can still get good flushes out of this Mycelium.

Mycelium growth type is hard to predict. Tomentose may turn into rhizomorphic, and your substrate can develop both types of growth.

Ultimately, the type of growth does not really matter as long as it’s not mold growth.*

Mold Contamination on Mushroom How to Spot and Treat
Can you identify these four other types of molds? You might want to know how to spot them before encountering them in your mushroom block.



Curative Mushrooms has to post the standard FDA Disclaimer…The statements made regarding medicinal mushrooms have not been evaluated by the Food and Drug Administration. The efficacy of these products has not been confirmed by FDA-approved research. Curative Mushrooms is not making claims intended to diagnose, treat, cure or prevent any disease. All information presented here is not meant as a substitute for or alternative to information from healthcare practitioners. Please consult your healthcare professional about potential interactions or other possible complications before consuming the medicinal mushrooms. The Federal Food, Drug and Cosmetic Act requires this notice.


This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of such advice or treatment from a personal physician. All readers/viewers of this content are advised to consult their doctors or qualified health professionals regarding specific health questions. Neither Curative Mushrooms nor the publisher of this content takes responsibility for possible health consequences of any person or persons reading or following the information in this educational content. All viewers of this content, especially those taking prescription or over-the-counter medications, should consult their physicians before beginning any nutrition, supplement or lifestyle program.


Always looking for ways to improve the health of myself and my family led me to the discovery of medicinal mushrooms and the numerous health benefits they have on the body. My mission is to spread this knowledge and help as many people as possible.

This Post Has 4 Comments

    1. Hi, Ed. Z Strain, also known as “benzies” or “cubies,” is a type of P s i l o c y b e c u b e n s i s . At some point, a modified strain of the P. c u b e n s i s mushroom was created, giving rise to the Z Strain.

Leave a Reply

Your email address will not be published. Required fields are marked *

The maximum upload file size: 1 MB. You can upload: image. Links to YouTube, Facebook, Twitter and other services inserted in the comment text will be automatically embedded. Drop file here

Back To Top

Get Your 'Happy Mushrooms For Sad People' Grow Kit Now & See How Easy Growing Mushrooms At Home Can Really Be...

Even If You Have Never Grown Anything Before In Your Life You Can Get Your Own Happy Mushrooms Grown At Home In The Next 30 Days (Everything You Need Is Included)...
YES!  Give Me My Happy Mushroom Grow Kit Now!