HENDERSON'S HANDBOOK OF PLANTS. 



COL 



CoHapsion. The act of closing or falling to- 

 gether. 



Collectors. The hairs found on the style of 

 such plants as the Campanula, and which 

 collect or brush out the pollen from the 

 anthers. 



Collemaceoe. A natural order of Lichens, 

 distinguished principally by their gelati- 

 nous substance, and the green globules 

 which are so distinctive a mark of Li- 

 chens in general, forming necklace-like 

 threads. They are found in various 

 parts of the world. They attract little 

 notice when dry, but a few hours' rain 

 swells them out into beautiful objects. 

 One of the most curious genera is Myr- 

 langium, found in the south of England, 

 Algeria, Australia, and the United States. 

 It grows on the trunks of living trees, 

 and is remarkable for the high develop- 

 ment of the sacs or asci, in which the 

 sporidia (which see) are contained. The 

 species grow on trees, rocks, and the 

 bare ground, and, if Lichina be included, 

 in situations exposed to frequent immer- 

 sion in the sea. 



CoUenchyma. The cellular matter in which 

 the pollen is generated. It is usually 

 absorbed, but remains and assumes a def- 

 inite form in some plants, as in Orchids, 

 or delicate threads, as in CEnothera. 



Cottinus. Growing on low hills. 



Collum. The point of junction between the 

 radicle and plumule, or the root and 

 stem; the point of departure of the 

 ascending and the descending axes, 

 (which see,) or the stem and root, which 

 is commonly called the collar. Also, the 

 lengthened orifice of the ostiolum (which 

 see) of a Lichen ; colliform is sometimes 

 applied to an ostiolum whose orifice is 

 lengthened into a neck. 



Color, (adj. Colored, Coloratus.) Botanically, 



COM 



this term is used to denote any color ex- 

 cept green. In technical botany white is 

 regarded as a color, but green is not. 



Colorans. Changeable, colored. 



Colorate. Colored, painted. 



Colpenchyma. Sinuous cellular tissue. 



Colum. An obsolete term for the placenta. 



Columbinus. Resembling a dove in shape 

 or color. 



Columella. A little column; the firm cen- 

 ter of the spore-cases of an Urn Moss, 

 from which the spores separate; the axis 

 or stem of the fruit of Mosses. The long 

 axis around which the parts of a fruit are 

 united; in reality, the ripened growing 

 point.' A slender axis over which the 

 spore-cases of such Ferns as Trichamanes 

 are arranged. Also, an axis to which a 

 carpel of a compound pistil may be at- 

 tached, as in the Geranium. 



Column, Columna. The combined stamens 

 and styles forming a solid central body, 

 as in Orchids, etc. 



Columnai~is. Having the form of a column, 

 as the stamens of a Mallow. 



Coma. The hairs at the ends of some 

 seeds; the empty leaves or bracts at the 

 end of the spike of such flowers as those 

 of the Pineapple. 



Comatus. Tufted. 



Comose. Furnished with hairs at the end. 

 See Coma. 



Combinate-venose. When the lateral veins 

 of a leaf unite before they reach the mar- 

 gin. 



Combretacece, (Myrol)alans.) A natural or- 

 der of polypetalous Calycifloral Dicotyl- 

 edons belonging to Lindley's Myrtal 

 Alliance. They are trees or shrubs, 

 with alternate or-- opposite entire leaves 

 without stipules. The flowers are some- 

 times imperfect, some having stamens 

 only, and others pistils only, and occa- 



