Prepared for B.Sc. I year Botany based on the prescribed syllabus of Dr. Babasaheb Ambedkar Marathwada University

1. B.Sc.I year
Semester-II, paper-V
Histology: Secretory
tissues
Dr. A.S. Naik
Head, Dept. of Botany
SBES College of Science.

2. Glandular secretary tissues

3. Internal glands: 1. Laticiferous Tissue
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4. Laticiferous Tissues
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5. A. Laticiferous cells/non-articulated
ducts
• These ducts are independent units which
extend as branched structures for long
distances in the plant body,in all the directions.
• Show repeated branching, but they do not fuse
together, thus no netted structures are formed.
• The walls of the ducts are soft and very often
thick. Such ducts are commonly found in
Calotropis, Euphorbia, Nerium, Vinca, etc.

6. B. Laticiferous vessels/articulated ducts
• These ducts or vessels are the result of
anastamosing of many cells together.
• They grow more or less as parallel ducts
which by means of branching and frequent
anastamoses form a complex network.
• latex tube is living and coenocytic.
• found in angiospermic families —
Papaveraceae, Compositae,
Euphorbiaceae, Moraceae, etc.

7. External glands

8. External glands: 1. Nectories

9. 2. Oil and Resin glands/ducts.